@futurebird @SnowyCA with my parents, the trick is, after explaining at length maybe a few times, get someone else to suggest the same thing, maybe an older family member or one of their friends. I think they subconsciously think that you're still just a kid and they know better, but when it comes from a different source they take what they already know and actually pay attention to it.

The number of times I've had various people explain to me things I told them ages ago.. I don't even feel bad anymore.