Bauble, Me and the Family Tree

Noel is used to his unusual family set-up: him, Mum, super-brainy little sister Bauble, and his gay uncles (both called Mike) next door. But when Bauble spots Mum kissing Santa Claus-in August-everything Noel thought he knew about his family is turned upside-down. Who's the mysterious 'F' sending Mum romantic postcards? Why has she started taking weird photos of people in food bikinis? And, even though he's clearly not Santa, might Dad still be alive after all?