How are the family units created in the community in The Giver?

Family units are created by a committee.  The purpose of
the family unit is to raise children between the ages of 1 year and adulthood.  There is
no love, and families do not have their own children.  One male and one female adult are
matched based on complementary personalities.  Only adults that are deemed to be good
potential child-raisers are considered.  Other adults remain
childless.

Once two adults are paired, they are given one
boy and one girl.  The pair first apply for a child, one at a time, which is granted by
the committee.  The family is given a baby once it is named, at the Ceremony of One. 
Before then, the babies are called by their number only.  The babies come from
birthmothers, and are likely genetically engineered.  The family can only have one boy
and one girl at a time.  If one of the children dies by accident, the family can apply
for another.

It is unusual for the two children to be very
far apart in age.  Usually there wil not be more than three years difference between the
two, but the parents are the ones who decide when to take the second child.  There will
always be one boy and one girl.

Once the youngest child is
grown, the family unit dissolves and there is basically no relationship between the
children and adults.  The children form family units of their own, and the adults move
to the childless adults area.