"Mia avo donis monon al siaj nepoj" is given as a correct answer, but wouldn't that mean he was giving money to his grandsons, not his grandchildren?
It seems that in modern usage, nepoj can also be taken as the gender-neutral, unspecified term. While this is fine, it's not consistent with what the course has previously taught.
If nepoj took the gender-neutral term in modern usage, can I just use the plural for other terms or do I have to specify ge- for anything other than grandchildren?
I am not an expert. But after my investigation it looks that you use ge- if you're sure that there are female(s) and male(s). If you're not sure you can use plural. It works for all(almost) words.
That's what I thought as well.
Genepoj means "male+female", nepoj means that you do not know the sex. The same with patro. If you want to say "parent" you use "patro". Some people use -icxo for male.
Far from being given as the correct answer now, "Mia avo donis monon al siaj nepoj" is marked wrong.