When they were about 12, they requested a little sister.

Kitty: “I’m not married.”
Offspring: “Even *I* know that’s not required.”
K: “But, it’s easier with 2 parents.”
O: “I’m old enough to help out. “
K: “She would want to play with your toys.”
O: “I would tell her to stay out of my room.”
K: “Yeah? How well does that work with you staying out of my room?”
O: “Never mind. We’re good.”

The neighbors may have heard me laughing.