Let's get serious now!!!

Today I came across some videos on how to change a diaper(Mostly was looking so I can help the father learn) and decided to grab a toilet paper roll and a diaper and ask him to pretend like it's a baby and try to put the diaper on...his response was "why would I need to learn when I'm not going to be the one changing diapers"....I need some advise here forreal because he is playing this like a joke and there isn't much time left to prepare for our son to be here....