Suppose the Cote family truly enjoys digestive biscuits.
Late one night, Papa Cote ate one-sixth of the family's digestives.
Early the next morning, Mama Cote ate one-fifth of the remaining biscuits.
Shortly thereafter, Brother Cote consumed one-quarter of the delicious snacks left.
At lunchtime, Sister Cote devoured one-third of the remaining tasty treats.
Finally, Baby Cote ate one-half of the remaining digestive biscuits.

How many delightful digestive biscuits were at first?

I can't quite figure out how to solve this... I would imagine that there should be an end amount or some value from in between... I just don't know. Please help?