The area of a law that is mainly about the issues surrounding relationships in a family, adoption cases, child custody, divorce cases, etc. are going to fall under the family law. You may be able to find attorneys that specialize in this area of law.
Most of the time the attorneys that you can find specializing in family law are going to help with divorce cases or adoptions across country lines. Custody and child support issues are also going to fall under the family law as well. A lot of people who are going through a divorce will more likely find an attorney specializing in family law.