I know I'm massively late to this party, but as an Asian-American, none of this struck as peculiarly Asian to me. It's not that unusual in American culture for people to work within a family business or feel obligated to look after a parent. I know of at least two families off the top of my head where many members of the family work for the family business, and both were the whitest Midwestern whitebread you could imagine. Children going into the same trade as their parents is hardly uncommon in any culture; look at Donald Trump or the Kennedy clan. As for taking care of a mother, any advice column archives you care to mention, including Savage Love, is chock-full of people torn between taking care of a parent and living their own lives. Evil and overbearing mothers-in-law who hate their daughters-in-law are practically a cliche in every culture. So I'm not getting how any of this indicates an Asian family.

The fact that the parents are getting divorced actually make this LESS likely to be an Asian family, in my opinion. Divorce is highly stigmatized in most Asian cultures, especially amongst older Asians, and even more so if you're well-to-do or highly respected in the community, since saving face is even more important when you've got more to lose.

Also the insults the future MIL used don't sound particularly Asian to me. Asian slurs against women tend to be more of the "slut" and "whore" variety. I can't even imagine how "dog-hating" would work as an insult in an Asian context, since dogs as beloved pets are a fairly recent concept in Asia, and dogs were generally thought of more as workers/servants or luxuries/status symbols than family members for a long time.