"The mom is good!"
I'd like to add, usually you would refer to someone specific as אמא, אבא, סבא, סבתא if they are your own parents or grand parents, and you are speaking to someone who shares them with you, a sibling, or in the case of grand parents, a cousin.
Or speaking to someone about their own relative
תשאל את אבא
Can mean "ask dad", as in YOUR dad
You mean that the one who told the other to "ask dad" is a relative of this dad ?
No. I mean I might say to someone (typically a kid) "ask dad" or "ask mom" even though I don't call those people mom or dad.