In general terms, public law involves interrelations between the state and the general population, whereas private law involves interactions between private citizens.
The concept of private law in common law countries is a little more broad, in that it also encompasses private relationships between governments and private individuals or other entities. That is, relationships between governments and individuals based on the law of contract or torts are governed by private law, and are not considered to be within the scope of public law.
Family law family-related issues and domestic relations including, but not limited to marriage, civil unions, divorce, spousal abuse, child custody and visitation, property, alimony, and child support awards, as well as child abuse issues, sex, breast implants, and adoption.