Mother and father with their two sons. The woman on the right does not have a wedding ring so I am guessing the wife is on the left. Perhaps the grandparents in the window above. The youngest son has on the uniform of a Saxon hussars.
Dated on the back 10/22/15 this soldier is a member of Cameronians (Scottish Rifles). The T on his shoulder strap puts him in the Territorial Forces. Wearing shorts in October might place him in the 1/7th Battalion which was in Egypt and Gallipoli at the time.