If it's sent to my mom, I could play it off like, "Hey, I feel like there's something wrong with me, how does this look?" With my dad, it would be weird. So I would pick my mom.
I can't think of a good would you rather question, so I'll do one I already have...
WYR (ladies, imagine having a dick) ejaculate twice as fast but twice as much, or ejaculate half as often but half as much?