little girl walks into the bathroom...

A little girl walks into the bathroom and sees her older sister just come out of the shower. The young girl looks at her sisters pussy and asks "What's that?" Her sister replies "That is my possum, sis!" The young girl replies "Oh, OK" The next day she sees her mother get out of the shower and a pointing at her pussy again asks "What's that?" Her mother replies "That's my possum!" The young girl again replies "Oh, OK" The next day she sees her grandmother getting out of the shower and once again pointing at her pussy asks "What's that?" The grandmother replies "That's my possum!" The young girl replies "Oh, grandmother, is your possum dead?" The grandmother, looking a little dazzled replies "No, deary, why do you ask?" The young girl replies "Oh, its just that your possums tongue is sticking out!"