Math homework
Whatever happens, make sure that before your kid goes to school you know how to do some basic math. It will help you a lot in the near future when they bring home some questions that you need to help them out with. Math sucked back then and it is not easier now.
At least make sure that before you get married, either you or your partner are good at math. Whoever is the unlucky soul that was blessed with math skills needs to be the one who helps the kids out with their homework. It’s just an unwritten rule. Math skills are a gift and a curse we suppose.