You cannot control whether your cousin shows up to the BBQ with a political rant or whether your mother respects your parenting boundaries. But you can change how you react. Based on the best (and worst) family drama tropes, here is the life advice:
Who sacrificed for whom? Who is owed? Parents often keep silent ledgers (“I gave up my career for you”). Children resent being born into debt.
A final caution for the writer. There is a razor-thin line between (intense, believable struggle) and Melodrama (exaggerated, irrational hysteria).