It's in bad taste, but I laughed, so...
A girl asks her dad, "Why am I called Rose?"
The father replies, "Because a rose petal fell on your head when you were born."
Then her sister asks, "Why am I called Lily?"
The father replies, "Because a lily petal fell on your head when you were born."
Her brother says, "ERTGTHREGERG£$%£$^£EGRD!!"
The father replies, "Shut up Cinderblock."