From the 1911, it looks like Ada and John had several of the children ahead of their marriage.
They are at 23 Rosaville Road, Fulham. John is aged 38, born Clonmel, shown as a Door Porter, for a caterers.
Ada is 32, born Paddington, and the children are Winifred May, 6; Kathleen Olive, 4; Albert Earnest, 2; and Gladys May, 8 months. The two eldest children are shown as born in Paddington, and the younger two born Hammersmith.
Ada said she had been married for 7 years (neatly fitting with Winifred's age), and that there are 4 children on the marriage, all living.