Oh Debbsy - I feel for you, hormones don't help either. My dh is fishing mad and before we had ds he was fishing every spare moment (to the point that he was fishing a lake where he had no reception on his phone a week before my due date and thought it was okay to leave me a main number of the fishing authority, who I could call if I went into labour and they would then send somebody to the lake to get him )- even when I moaned to MIL about it, she used to say, well fishing is his first love you will have to get used to it BUT in his defence as soon as ds was born he didn't want to go - and still to this day 21 months later is not as obsessed as he was before
I think that it is harded for men to grasp the reality of a baby until it gets here (and even then it can take a while) but I am sure when you have both calmed down and your bibby is here dh will do the right thing. He might even tell his mum where to get off.