What is a Family Bed?

The Family Bed is a bed used by the whole family.
This arrangement is also known as 'co-sleeping'.

One can think about some 'volumes' to a Family Bed usage, like:

1. ('Initial':) A baby sleeps, in a separate crib, next to parents bed.

2. Baby or child is put to sleep in his own bed.
    Early in the morning or in the middle of the night, he moves to the parents bed.

3. Baby sleeps in parents bed.
    At some age (6 month, 1 year, 3 years or other), the parents move her to her own
    bed.

4. ('Advanced':) All children are allowed to sleep in the Family Bed whenever they like.
    They can decide if and when they want to sleep alone.