In the 1891 census, the family were still living at 53 Laxey Street with a total of 5 children and a servant. William Simpson was a cow keeper and an employer.
On 12th Jan 1907 John Simpson married Edith Mary Bretherton at St Mary theVirgin, West Derby, Liverpool.
Source Citation: Place: West Derby, Lancashire, England; Collection: St Mary The Virgin; -; ; Film Number: 1546071.
The 1911 census has John and Edith living at July Street, Anfield with their son William Reginald Simpson and Emilie Bretherton who I presume to be Edith's sister although Ancestry have mistranscribed her as a daughter.
John and his family emigrated to Canada, ~I have more information to add about this.
Thanks to the Canadian Archives online, here is a copy of John's attestation paper. It shows that they lived at 260 Victoria Avenue, Hamilton and his occupation was cabinet maker. He was already in the 'active militia' and had served in 13 Royal Regiment 'G' Coy. He attested for the Canadian overseas expeditionary force on 28th July 1915 and was put in the 76th overseas battalion with the regimental number 141288.
John was awarded the Distinguished Conduct Medal for gallantry and distinguished service in the field. The certificate shown below (a public photo from ancestry.co.uk) has a photo of John Simpson and the citation for his D.C.M. (it is missing one digit from his regimental number)