They've said she moved to London and moved in with them years ago.To be fair to Brian & Arthur I always got the impression (long before the surrogacy) that they already seemed to look after Aoife. In fact (and I have absolutely no reason why) I always felt a little sad that she seemed to be on her own and that B&A thought so too and they seemed to out of their way to include her.
I always only had the impression that Brian (& Arthur) absolutely adore all the women/sisters in their lives (and all their kids...and Donal & Sophie Skehans kids!).
I get why people could find Brian an absolute dose, but some of the cynicism people are viewing his relationship with Aoife with or his reasons for wanting kids when he so clearly dotes on the other kids in his life I don't get.
Listen to his interview with Amy Huberman if you haven't already is all ill say!