Does declan galbraith have a little sister?

Does declan galbraith have a little sister?
Whoever's "not telling because of privacy" has got to be kidding. Yes, he has a little sister. She's made a brief appearence in Declan's debut album promotional documentary and in another, later documentary too. And she's even been in a photoshoot with him. Her name is Bernadette and is four years younger than her brother. Any more personal detail naturally has not been published and should not be published. Seeing to how little she appears in Declan's spotlight, she seems to prefer her privacy.