Hi Marianne
I have carefully looked through the postcards.. A lot are blank on the back.
I am guessing here but I think a lot of them of from their father. They are addressed to a Mrs Frank (I think) Stent.. West End Havant. Miss Phyllis Stent and Leslie Stent at the same address. Some are addressed to Leslie at school St Helens College Southsea. Leslie also has the initial D.
One or two are addressed to Manor Farm Cocking, Midhurst, Sussex. Perhaps they are on holiday there (?) The date range is I think because postmarks are not that easy to read are about 1913 to 1919.
Do these ring any bells? I could possibly send you a few initially and take it from there.?
I do live in this area so if I can be of any help please let me know.