Turtle twins

Molly: "Turtle twins" are twins, but they don't look EXACTLY alike.

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Midget power

In the new Mario games, there's a mini mushroom that makes you smaller. (You can float, run on water, etc.) Liam calls it "Midget Power."

Pientist

Molly says the main character on Cloudy With a Chance of Meatballs is a Pientist "...because he's a scientist who makes food. Get it?"

Growing pains

Liam: "Dad, you said if I laid down, I'd get a little taller, but I've
been trying, and it's not working."

Androgenous

Molly was mistaken about the gender of her new friend, so Meg told her
to ask for a name and guess gender from that. Molly: "But it said its
name was..."