Alice Carter
From Tardis Wiki, the free Doctor Who reference
She has a connection to something mysterious from Jack’s past, his daughter and lives in Cardiff with her son and Jack's grandson, Steven – who, like every child in the world, is briefly taken over by the 456. She appears in part one when Jack visits her and wants to do some tests on Steven. Then, Alice tells her father to leave, and he does to visit Dr Rupesh. Alice's son, Steven, thinks Jack is his uncle.
Candidates for mother
While it is possible that Alice's mother has not been met, candidates include Jack's unnamed wife (TW: Something Borrowed).
