Getting the oil changed

Took Amelia with me to get my oil changed at the very local Mayberry-type filling station. The owner's elderly uncle stopped by and was chatting with another regular. Amelia watches them for a few minutes and then says, "When those grown up boys are done talking to each other, I want to tell them something."

I have no idea what she had in mind but after the uncle left, she did chat up the remaining customer whom I know as an acquaintance. He asked her what her name is and when she asked him his, she responded, "I have a Daddy named David!" (how many daddies does she have?)