: you'll find the sweet sounds of 10-year-old annabelle pierce performing taylor swift with her dad mikeplaying and watching music is really fun for us. >> reporter: it's an unbreakable bond ♪ only heightened by a recent trip to swift's "eras" tour, but they're not in harmony -- >> show me that brock purdy. >> reporter: -- on one big thing. >> mccaffrey can't catch it. >> reporter: who to support in the super bowl >> who do you support, annabelle? >> chiefs all the way. >> since the age of when >> since the age of when taylor started dating travis. >> reporter: you see, while mike is part of the 49ers faithful, annabelle's idol is taylor swift. >> you can't go anywhere without having a swiftie around, because, like, you can't go anywhere without having chiefs fans except maybe, maybe downtown san francisco. >> reporter: in many ways it's brought these two even closer together >> all the dads will get together and watch the football games, and our daughters all now want to come and watch them with us. >> reporter: the duo might be living in a house divided, but they do agree on taylor's m