Does "married adults living with parents in parents' house" count as breaching the third precept? It's very common for unmarried adult Asians in Asia to continue to live with their parents. Some choose to move out once they're married, some people for some reasons choose to stay even after they're married.

One of the object of transgression of the third precept is having intercourse with those "protected by parents". My understanding is, generally speaking, protected children are underaged children, children who are vulnerable to unwanted advances and financially dependent. 

In the case of a married adult couple who is already mature and independent but can't afford to buy a house therefore the adult child with his wife live with his parents in his parents' house, does this count as "protected by parents"? How should one determine the scope of "protected by parents" according to the precept?
I am confident that a married couple who live with their parents are not in violation of the precept against sexual misconduct. If anything the question would apply to the marriage decision (asking parents for consent), but certainly not sexual activity that happens after the marriage.

IMHO the point is that you need consent before having sex, and in the case of young people, you should not treat their own consent as acceptable because they are too young to decide, so any time you aren't sure, their parents should be involved in the decision. Honestly that sounds horrible either way, but we can imagine young people getting married and how the consent of parents would often be a factor in that union not being misconduct, especially in an ancient society.