So this is going to be a bit long, sorry. I know every family is different, but these issues are pretty common, especially in 1st and 2nd generation families.
A big thing was the expectation that women care for the house and the men. XBIL was the only other brother that married a white woman, and it was this weird dynamic that they were "whipped" if we got what we wanted regarding, well, anything. The other wives were, at least outwardly, very submissive to their husbands.
When his parents needed anything, especially money, there was an expectation that all of the boys WOULD give them money, i.e. replace the roof on their home, even though they could easily afford these things themselves.
It became very obvious when his father became increasingly ill and the family was completely unwilling to talk about end of life planning. My grandmother was dying at the same time, and it was very interesting to watch how each family dealt with these decisions, and stress in general.
Oh, and we ended up living next door to MIL, FIL, 2 BIL's, their wives and kids, and down the street from another BIL and his family for over a year and a half. This is not terribly uncommon amongst 1st generation families with some $$. This did exacerbate everything. When we bought a house 15 minutes away, we were "abandoning" the family.
All of this is true except for your first point. Living in a Hispanic country, you see that the new generations are not like that at all. I will be damned if my SO is not willing to help out around the house just as much as I do. I think that a lot of people use culture differences to their advantage. Hey, I don't want to clean shit, well I'm Hispanic so Im different and you need to understand it.
His parents were much older, and it was this loyalty thing- they care for you when you are young, you care for them when they are old. And a way to demonstrate that you have "made it"
This is pretty common in other cultures I found too, especially the Chinese culture.
my ex-bf was Chinese (he was born there) and there were a LOT of cultural issues that affected our relationship, but the bigger ones (that I was not really willing to deal with) would be more noticable when married.