This is hypothetical.
I'd rather accidentally send one to my parents, because I feel like they'd know it was on accident and would just ignore it. I luckily don't have the kind of of parents who would give me shit for it or make it into an embarrassing story every holiday. They're not that bad.
Whereas my exes, would not believe it was on accident. And at least one would take it as an invitation and try to come back again. Plus there's if I have a girlfriend, she wouldn't believe I accidentally sent one to an ex either. But she would believe my parents' was accidental.