They don’t mind if the baby pulls their hair then licks their face. In fact, they recognise this as the great compliment that it is.
They know that a baby can never have too many books, even if the baby primarily uses these books for chewing purposes.
They’re the only ones besides your partner who are genuinely interested when you start talking about the color and frequency of your baby’s poo.
They believe that your baby is a genius. Nothing will convince them otherwise, even when the baby licks the couch or tries to eat toilet paper.
They’re willing to babysit so you and your partner can enjoy a meal out together. Alone! In a restaurant! With beer!
They did all this baby stuff for you once. Comforted you when you cried at 4am. Cleaned up your poonamis. Read you the same book over and over until they wanted to poke their eyes out. Made you dinner then watched you throw it on the floor. They are superheroes.