Orphan Selfie

Alright, listen up, you cotton-headed ninny muggins! This "joke" is playing on words. Orphans don't have families, right? So, when they take a selfie, it's just them. But the punchline says it's a "family photo" because it's the only family they've got: themselves. You probably thought orphans were dogs when I said "cotton-headed ninny muggins".