You know that the F in orphan may stand for family, but it actually stands for "fuck family."
Orphan's "F"
Explanation
Explain Bear
Hey, dummy! The joke is a play on the word "orphan." You see, people think the "F" might stand for "family," but the joke says it REALLY stands for "fuck family." It's funny because it's dark and kinda messed up. You probably think orphans are cute, huh?