I'm currently living this with a 1.5 and 2.5 yo. I also came from a similar home life so had some idea of what it was like. I had a great childhood. But this shit is hard. The main diffence was that was the 80s/90s and my mum didn't have to work.
He is a great guy, and a brilliant dad, but we are not working as a team currently and it is effecting the relationship. He is also just happy for me to take on the responsibilities. We have not ironed out all the kinks since I have gone back to work 6 months ago and I do think that if we had communicated better from the off and ironed out expectations and minimum standards it would have helped.
He was also of the mindset that it would work itself out, but in reality, as his shifts are set it really means that it's me who works it all out. I am the breadwinner and currently working full time condensed hours to fit it all in. I know he is tired, we all are, and it increasingly difficult to have sympathy for his shifts. I do too much but this week I've decided to no longer be the martyr!
The main bones of contention are division of labour and rest days. I get zero rest days. There are no downtime days for me. He gets at least 2 full days a month and multiple half days where he has no children and is off. He sees these as rest days where he chooses to potter and to fit in his hobbies. Lucky him. He's about to get all the laundry responsibilities handed to him, some meal prep, and my decision to move some of my non working days to accommodate a few rest days for me. I think it's the only way I'll keep my sanity.
I'm also planning on hiring a babysitter so we get at least one night as a couple a month. We need to some time to connect and not just be overworked ships in the night.
Although this post reads as negative, i hope it doesnt deter you. It is difficult but doable. Our kids are great and have two loving parents. We have a good life, but it takes work and is intense. It requires constant tweaks as kids/we move through different stages. Just try to be a team. Read the book Fair Play. It's a good way to start the conversation or think about how to break things up that works for all.