Uno

Ian and Lea grew up together as best friends which means that nobody can tolerate his philanderings and asshole tendencies except her (she's not shy to call him out on his shit too) and nobody can tolerate her temper and attitude except him. It's the two of them against the world so when a baby is dropped at Ian's doorstep, the first logical thing for him to do is call Lea. From two, it's going to be three, a manchild daddy, a bitch "mommy", and one little cute baby.