I think this is the crucial sentence in the OP
" I then made the meal and then turned on the laptop and DH said "if you are doing that I'll go and see my mother""
He doesn't like you being on the laptop! It's nothing to do with his mother - if she wasn't there, he'd find something else to do while you were on it, like going to the pub with his mates (would you prefer that?) or going and fiddling with the car engine.
MrA hates me being on Gransnet. If he's lurking about the place, I have to be ready to quickly switch to Excel and pretend I'm doing the accounts 
Good Morning Sunday 19th July 2026

. Make the most of it, gluten. I would. Or join in.