New here; husband left

[MrBond]

"I said I was sorry he was stressed and I know he has a lot on his plate."

This part is good.

"And how could I help him."

This part not so much.
It's not your job to "help" him. In fact, he left you with a baby at his grandmother's house.

Helping his grandmother is a nice gesture, but let's face it. This is between he and you. If he gets angry that no one is going to help his grandmother after you leave, then he can hire a housekeeper.

Take care of yourself and your baby first. He's not a real man to have left everything like that. He's stressed? Poor baby. I guess taking care of the kids was too much for him so he left you behind.

IMHO you need to move out to get your head on straight first. Don't let the family suck you into their drama. I'm sure they mean well, but you need to take yourself out of the noise of the drama to think clearly.