Why did the mother marry a dude if she is obsessed with boobies? Seems sus ngl
Maybe to produce a daughter with big boobs she could fuck. Maybe mama is a very long-term planner.
I was actually thinking about this issue back when I was taking a piss at uni some hours ago... And while it's very likely yours is true, there's a non-zero chance she used to have trans GF/wife. (Though there may or may not be a lack of understanding on my part over whether that works or not)