I guess the West family is full of inappropriate jokers. Gross.
Edit: Due to some sleuthing from Buzzfeed, it appears that the picture wasn't taken today but it was posted today.
Edit 2: Jennyduck found an update: "The daughter has since deleted her instagram account and is apparently "mortified." Says the dad: "We're not always proud of things our children do, but we love them anyway, and then we move on."