My dad offered to come 'help' after baby is born and I'm dreading it
He means well but he's the type to want to take over and do things his way. My wife is stressed about it too. How do you set boundaries with parents without being an asshole? Do we just say no? Say yes but set rules? I don't want him there for the whole first month like my mom is suggesting.
Your wife's stress is the key thing here. If he's creating stress instead of relieving it he's not really helping. You might need to have a conversation with him about that before he arrives, or keep the visit shorter than he wants.