having hard time

Mom • My name is Raschel. I`m married and have a wonderful 4 year old son and a beautiful rainbow baby girl born nov 2016.
My husband and I had a baby last nov. three days after she was born my father in law passed away. It's been so hard on us. My husband inherited a thriving business and he works 7 days a week. I'm not exaggerating he literally works every day. He gets up at 9:15 goes into work until 10:30 comes home, eats lunch with us, then takes a nap and goes back into work at 3. We have a 4 year old son and a 3 month old girl. Any other spare time he goes to his moms house to talk with her. Sometimes he leaves work in the evenings to go to her house for an hr or two just to talk instead of coming home to help with the kids. Now he tells me he's going to start going with her to look for a house for her to live in. I feel like I'm raising our kids on my own. I know he's doing his best, but I just feel so alone. Anytime I try to talk to him about it we end up fighting and threatening our marriage. Am I being selfish and unreasonable? I'm looking for honesty. I am a stay at home mom and I feel like I'm tired all the time with no help with the house or anything. I just feel like he should be putting some of his extra time into helping me. Sometimes I think he forgets that I still need him too. Idono any advice is welcome. Thank you.