Hi there Kayzee,
I know that this reply is two years old and the thread doesn't indicate whether or not you have uncovered the information that you wanted about John Alsop, born circa 1865 in Glasgow, to Frederick and Annie S Alsop, both born in England (Annie S certainly born in Birmingham). My information more directly concerns John's elder brother Frederick William Alsop, but may be of some interest to you.
Their father appears to have been in the Iron Foundry business (unfortunately one cannot see the original
mss on ancestry for the censuses, so have no idea what the garbled transcription means). Frederick William became a Leather Merchant; another brother, Harry also became some sort of Merchant. Their mother and FWA, Harry and daughter Jessie, together with her husband, can be found in London in 1891; where everyone else was I've no idea, but Annie/Anne/Ann S Alsop was recorded as a Wife, not Widow. They were living at 2 Struann Villas, Market St., Finchley, Middlesex. (RG12/1055 F111 p.14 GSU: 6096165).
FWA married Marie Julie Lienard, daughter of Wine Merchant Karl Pierre Lienard of Saumur France and Emily Rishworth, second daughter of Thomas Rishworth and Mary Cornelia Hunt (the Rishworths are my connection). Both FWA and MJR were in their later 30s when they married.
FWA died in 1922 in Northamptonshire and one of the people he made an executor was his brother John Alsop, artist (I can give you the citation for this if you wish).
If I can help in any way, please let me know.
All the very best,
Anne
