It can vary. I have a daughter who is almost 13, and her mom died when she was a baby, and it was just us. So we're REALLY close. She enjoys all the same things I do, she's almost like a son really! And that hasn't changed even though she's getting older, and I have a new girlfriend who has a 13 year old son. She prefers boy activities, and my girlfriends son will tag along with us on all of our activities. But just because Evan has a father figure and my daughter has a mother figure doesn't mean that we will basically switch parenting roles. Evan is definitely a mummy's boy, and Riley is definitely a daddy's girl! She is comfortable discussing anything with me, I gave her 'the talk' and I bought her first bra recently. She has never had anyone else other than me up until now, so our relationship is fantastic. But it really depends. In Riley and Evans case, they've only ever had 1 parent, so obviously... But generally i'd say mothers and daughters and fathers and sons would be closest