So you've had discussions and he's pulled the 'I bring in all the money' line. For some reason he thinks money is the only thing of value in a family, the only contribution worth recognising - that is odd. Again, it sounds as though he's not really interested in family life and having children.
On money, you could work out how much FT childcare for two would cost (approx £20,000 a year at nursery, then one of you, or someone would have to cover days when they're ill). Then cleaning, cooking, doing laundry, doing all the household admin etc. That's the financial contribution you make to the household. If you didn't, it would all have to be paid for. He'd probably say it wouldn't, as even if you both worked FT you'd do a lot of this stuff yourselves - but he doesn't do it, so that's not true.
Even then, with all other tasks covered, if you were both working FT, you'd have children to look after and spend time with every evening and weekend. He's not pulling his weight there by the sound of it - or enjoying being part a family.
It sounds as though he made a lot of assumptions about what family life is like and that he is imposing these on you, rather than finding out what you want from life, talking things through and agreeing a shared approach.
It's interesting that he draws upon 'what he thinks other people (the examples he picks to suit his case) would do' all the time, instead of focusing in what the people in your family want, need and can do.
It really doesn't sound like he cares about what you want, or whether you are happy, at all.
It is going to be difficult though, if you've almost always done everything, to explain why things need to be different now. He's used to being able to get away with laziness and having all the free time and will continue to as long as he can.
Starting from where you are, I'd say you need to make a case about what's different now, how much more work there is with two small children, that you do contribute and do need time off sometimes and and how you'd like him to be more involved in family life and their lives.