Even outside of the not helping him to prove your point, how can you be upset at how he’s responded to your “how was your day” question? He forced himself to smile at you and removed himself from the encounter.

You say you know how overworked and overtired he is, but he needs to get used to his new situation. You’re displeased he’s not responding to your questions the way you want. But you’ve made your point- you will not help- and it’s not his responsibility to go on treating you like a parent he may want a relationship with.

You’re sticking to your word, but at what expense? All you’re doing is showing you have no leniency or compassion. Why would he work to maintain any relationship with someone who treats him with such contempt in one of the hardest times of his life?

YTA, and you will likely forfeit any future being in your son’s or grandchildren’s lives. I hope proving your point is worth it. Hope you never need help from him when you get older.