get things

my brother doesn't get things. like i saw a movie for film class once and the guy and his ex-wife pretended to be married (still despite being divorced and i'm assuming on semi-good terms) for the guy's mom who was in the hospital for some unknown reason. i'm like OK but my brother is like why would you do that? mom explained that you do things for your spouse despite not being married to them any more which was why my mom called my grandpa "dad" even though he wasn't her bio. dad and not being married to his son anymore.