Sister jokes

you.

I saw my sister masturbating with a carrot. I said, "Come on, I was gonna eat that later! Now it's just gonna taste like carrots!"

I'm Gay.

My friend told me he had a sister. I asked if she was hot, and he said she was 8. That wasn't my question.

What do you call a nun in a wheelchair?

Virgin mobile.

What do you say to your sister when she's crying? -- "Are you having a crisis?"