At what age (if any) is it inappropriate for your child to sit on their fathers lap?

Tyra • Fluent in profanity & sarcasm | Aggressively positive♥️
Had an interesting conversation with my grandma. I've never really thought about it before but when my baby cousin (she's about 5) was sitting on my uncles lap during a cookout my grandma got upset because it was "inappropriate." In her opinion the only males lap a child should be sitting on is their fathers and according to her that becomes inapporiate once they reach double digits (I.e. 10 years old). What do y'all think?

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