Ataloss I think you can take it from what is on here that, as has been said before, one size does not fit all and you have to work it out as a couple/family.
In an ideal world you will both get to the point where you both see it as our marriage, our child, our money in our accounts, our responsibility to do the chores and we have an equal say in everything.
We do not live in an ideal world and have to learn how to deal with that and we all do that every day. For example, if you feel that you are doing too much then you discuss it, without recriminations, in a way that works out how you can both deal with that - as in getting a cleaner perhaps .... etc, etc. If I had a thought like that I usually told DH and asked him what his thoughts on it were and that made it a discussion point much more easily.
I wonder if you are able to talk to MIL about " life, the universe and everything" as that can be very helpful. She could be your best friend in trying to make the best of your marriage with her son. My own MIL was one of my two best confidantes. She would listen but never criticised and I had to listen hard to 'hear' the advice as it was never overt. Lovely lady! I miss her as much as I miss my own DM.
I wish you well, you sound a lovely, caring and thoughtful person. 