Maybe he still breastfeeds. Just getting mom primed up for lunch. It's 2024. Remember when that meant flying cars?
For context, I don't know any women who have squeezed their Dad's balls as a joke during a snuggle. Something is way off here in direct relation to the inappropriateness. Children who have been trespassed upon by relatives don't understand sexual boundaries as adults. I'm not saying the Mom did it, but if not, somebody in the family circle did and she looked the other way. That's how incest works.