it's my life

Little Johnny is bored all day, hanging around the house. He goes into his parents room and finds them having sex.
"What are you doing?" Johnny asks. "Uh, well, we're dancing." replies his mother. "What's daddy doing?" "He's my partner, now run along."
A few nights later, Johnny goes into his sisters room and catches her having sex with her boyfriend. "What are you doing?" "Ummm, dancing." "What's your boyfriend doing?" "He's my partner, now get out of here!"
Then Thanksgiving came around and Johnny's relatives were at his house. Johnny went into the bathroom and saw his grandfather beating his meat. "What are you doing?" Johnny once again asks. "Why I'm dancing."said his grandfather. "Well, where is your partner?" His grandfather replied, "When you've danced as long as I have, you don't need a partner."