No one word for a parent who's lost a child
A person who's lost his or her parents is an orphan. A person who's lost his wife is a widower. A person who's lost her husband is a widow. A person who's lost his or her child is... ?
Now, as far as I know there isn't such a word in English. Is there a word to name such a person in your language?
No language i looked up has a word like this. Maybe its just too sad.