re: I have often wondered if there's an English word for adult children. I could introduce my sons or my daughters, but if I want to introduce my 2 daughters and 2 sons, even though all are in their 20's, I seem to have no recourse other than to say:

These are the people in charge of finding me a nursing home one day.

(my daughter has already warned me that she will dump me in home faster than you can 'senile' or "broken hip" or....)

(