There is a possible sibling in 1925, with the same parents' surnames.
Leslie Page b. 1925 is in the free index to the 1939 Register at 108 Bridge Road, East Elloe R.D., Lincolnshire.
Living with Matthew Page, b. 1886 and Edith Emily Page, b. 1891
Was Stanley at home, or in forces?
Poss marriage
Dec 1920 Downham 4b 1002
Brown, Edith E - spouse Page
Page, Matthew - spouse Brown