Advantages :- It keeps your family away from other atomic families, which avoid stress and discomfort. The nuclear families are usually a well maintained economical family. 
Disadvantages :- The Father and mother, if both are working then in that case they have to leave their child or children alone or to be babysitted, where the child grows away from their family values. More towards the baby-sitter values ;). Maybe the child can even be abused.