In 1871, he was lodging at 24 Vincent Square on the corner of Alfred Street, Westminster, London, having recently married Elizabeth:
Job Toop Head M 50 Cabproprietor Dorset
Mary Ann Toop Wife M 46 Somerset Bridgewater
Mary Ann Toop Daur 12 Middlesex Knightsbridge
John Doyleaf Lodger M 50 Carpenter Middlesex London
Emma Doyleaf Wife M 46 Middlesex London
George Doyleaf Son 12 Middlesex Westminster
Edward Hoare Lodger M 32 Corporal Royal Engineers Wales Merthyr Tydfil
Elizabeth Hoare Wife M 36 Surrey Egham
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Edward married Elizbeth Knibbs (aka opera singer Lizzie Lemure) in 1871 and they went off together to live in Chicago, Illinois, USA. They separated after about 10 years and eventually divorced in 1888 due to Edward's infidelity with Emily Knibbs, identified in the divorce as his niece.
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Whilst I haven't seen a record of any marriage between Edward and Emily Knibbs, we can see Edward and Emily in 1900 with three children Edna, Darrette and Lilian, living at Hudson, New Jersey, USA. The census states that they'd been married for 20 years.
Edward Hoare Head born Sep 1840 59 Married (20 years) Wales Civil Engineer
Emily Hoare Wife born Apr 1863 37 Married (20 years) England
Edna Hoare Daughter born Aug 18 1881 Illinois
Darrette Hoare Daughter born Jun 1890 9 New Jersey at School
Lillian Hoare Daughter born Feb 1893 7 England at School

Edward stated that he had been in the United States since 1870, and that Emily had been there since 1879.
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Edward and the children were living at Elizabeth Ward 10, Union, New Jersey in 1910, but Edward identified himself as a widower.
In 1910 we see her living at Elizabeth Ward 10, Union, New Jersey
Edward Hoare 69, ENG/Wales - civil engineer, widowed
Edna Hoare 28, ILL - nurse
Dorette Hoare 19, NJ
Lillian Hoare 19 [17] NJ

Elizabeth's father died in 1849 and we can see that in 1851, all of her siblings were living at the Windsor Union Workhouse. Elizabeth was that little bit older so I presume that at 15 or 16 years of age, she was deemed to be old enough to make her own way in the world. Unfortunately, I can see no sign of her in 1851.
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We can see Elizabeth in 1861 living at 119 Bedford Street, Mile End Old Town, Tower Hamlets, Middlesex with her mother and brother Richard:
Mary Ann Knibbs Widow 45 Laundress Bow Devonshire
Elizabeth Knibbs Daughter Unmarried 25 Egham Surrey
Richard Knibbs Son Scholar 14 London Middlesex
Sarah Foster Lodger 25 Needlewoman Hertford
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Copies of newspaper cuttings have revealed that Elizabeth married Edward Hoare in 1871 at Scarborough, Yorkshire England. He was a Private in the British army, and she was an opera singer. They separated in 1880 after 9 years and eventually divorced in 1888. Elizabeth divorced Edward on the grounds of his adultery with her niece, Emily Knibbs.

Elizabeth and Edward Hoare went to live in Chicago, Illinois, USA, and in 1880, an Emily Knibbs (said to he her niece from England) went to live with them. We can see from newspaper cuttings related to Elizabeth's divorce from Edward, that she was a fairly wealthy woman.
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A playbill from 1867, featuring "Miss Lemure" at the McDonald's Music Hall, High Street, Hoxton, London
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An extract from the Rocky Mountain News (Denver Co.) 27 July, 1888:

HER FAITHLESS HUSBAND
CHICAGO, July 26. - Lizzie Lemure's life romance was told in Judge Baker's court to-day, and a sadder one is seldom recorded, even in divorce annals. Lizzie Lemure was a famous London opera singer, a protege of Lord George Paget, and as a friend and contemporary of Ada Isaacs Monken, the "Mazeppa" of Astley's theatre, she frequently met the Prince of Wales, and her mezzo-soprano voice was well-known to London opera goers. An artist's affections are proverbially erratic. Lizzie Lemure's were entrapped by the Adonis-like person of a private in the British army. There was nothing of Edward Hoare but his magnificent physical beauty and manly strength. In his red coat and "shako" me might have entrapped the heart of a better dowered bride than Lizzie Lemure. A private soldier's pay, however, makes him susceptible to any woman of means, and Lizzie Lemure had £8,000, so in 1870 Lizzie Lemure and Edward Hoare were married. The opera singer gave the soldier $130 to buy his discharge in the army, but she affirms that he did not spend it for that purpose. According to her statement, he deserted from the ranks and came to Chicago. She followed him in six months. With her money a house was purchased at Park Ridge and Mrs. Hoare's activity and energy procured for her husband the position of civil engineer on the Northwestern railroad, which position he has held for fourteen years. The couple's life was commonplace but happy in Park Ridge until eight years ago. In 1880, not having been blessed with children, Mrs. Hoare brought over from England her sixteen-year-old niece, Emily Knibbs. Emily was not pretty, but she was young and vivacious. "She lived with Mr. Hoare and myself as one of the family" said Mrs. Hoare, "and for a long time I was far from accepting that my husband could be so base as to betray her. It came like a peal of thunder out of a clear sky when Emily became the mother of a child. She tearfully told me who was the father. It was Mr. Hoare. I taxed him and he confessed. I was so overcome that I became ill, and when I could do so I took a trip to California. On my return I found that Mr.
Hoare and my niece were living together at my house.. I ordered her out and in a week Mr. Hoare left also. He told me he did not love me any more. He said he was bound to provide for and protect Emily and her child. The brazen girl was ungrateful for all I had done for her. She took all my bric-a-brac and the hundred little articles I had collected in twenty years, but I never chided my husband for his infamy; I loved him very deeply." Mrs. Hoare buried her face in her hands and seemed to be going back in memory to the days of Lizzie Lemure and Ada Isaacs Monken and the Adonis soldier who captured the citadel of her heart.
"Did you give your husband any provocation for this treachery" enquired Mrs. Hoare's lawyer.
Mrs. Hoare arose from her seat with flashing eye and swelling breast. The question dried her eyes. She seemed to be on the tragic boards again as she said, with an intentionally and dramatic gesture that caused Judge Baker to look up in astonishment. "Provocation! Well, yes. If you call taking him to Paris and spending £500 on him in a single month; if you call giving him all of my £2,000 which I made on the stage and £550 left to me by my mother in England; if you call that provocation, why, then, I suppose I gave him provocation. I loved him passionately. I was as true to him as any woman ever was to any man. Everything I had he got. He has absorbed it all, and to-day in the meridian of life I find myself heartbroken and penniless, with nothing but what kind friends give me in charity, while he lives in a hotel at Park Ridge, within a stone's throw of Emily Knibbs, with whom he spends his time and on whom he lavishes his salary as civil engineer. I have often rued the day when his fine form and shallow head lured me to this."
Miss Annie Shurfee said that Mrs. Hoare had only her house at Park Ridge and derived other necessaries for her maintenance from the
lady neighbors. Mr. Bonomy, a resident of Park Ridge, said that Hoare admitted to him that he was the father of Emily Knibbs' child, and told him that he no longer cared for his wife.
Judge Baker heaved a deep sigh as he told the lawyer that Lizzie Lemure's was a sad story, and she might have a divorce.
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An extract form The Daily Inter ocean Newspaper, Chicago Il, 27 July 1888:

AN OPERA SINGER'S DIVORCE.
Mrs. Elizabeth Hoare, of Park Ridge, secured a decree of divorce yesterday, before
Judge Baker from her husband, Edward Hoare, civil engineer for the Chicago and Northwestern Railroad Company at a salary of $125 a month. Mrs. Hoare said she was married to defendant Feb. 27, 1870, at Scarborough, England. About a year after the union they came to Chicago, and Mrs. Hoare obtained her husbands present position. There was one child, born in Milwaukee, which has since died. Mrs. Hoare testified that her husband was guilty of intimacy with Emily Knibbs, his 16-year-old niece, and that he had a child by her. On May 6th last he left his wife and went living with Miss Knibbs, and has since been contributing $40 a month toward the support of his niece and her child. All this time Mrs. Hoare has been on the brink of starvation while Hoare boards in style at Park Ridge Hotel. Complainant said she has been kindly cared for lately by Mrs. W.P. Black, and Captain Black appeared as attorney for Mrs. Hoare.
"I gave him no provocation for his conduct," said Mrs. Hoare. When I married him I had from $6,000 to $8,000. I took him to Paris with me. He was a soldier, and I gave him £31 to buy his discharge from the army. I gave him money and valuables, and I brought several thousand dollars to this country with me and spent it with him. Even the little fortune that my mother left me he refused to account for. The gold watch that he has got in his pocket now I gave him. It cost me $200. It was my handsome gold watch, and he exchanged it for another. When he left he took the furniture and all my little souvenirs that were made a present to me from some of the first artists in Europe. His niece is now staying with a friend of his, a man that is working in the same office, and they are walking and riding together, and I have never opened my lips from the time he left until this moment"
The decree also provides for the payment of $30 a month alimony.
Mrs. Hoare's maiden name was Lizzie Lemure. She was a London opera singer some twenty years ago, and a protege of Lord George Paget. As a friend of Ada Isaacs Menken, the Mazeppa of Astley's Theater, she frequently met the Prince or Wales. Hoare was a private of the British Army.