My grandmas on the 1911 census, as married, employed as a cook in "Frenchwood House,Preston" No sign of David. They had a son Robert Hornby Cahill B 1904, then from what I can find, grandma left him with a couple, as he's shown in the 1911 census as been a lodger with them. Grandma then sends for him when she married my granddad in 1914. But not a sign of David from when they married.
Thank you both for your replies.
Liz