Consult with a licensed family law attorney in the children's home state. Because of the constitutional, emotional and psychological issues involved in giving a non-parent guardianship over a child, courts follow very specific procedural requirements. Every state has its own specific procedures and only an attorney in your state can tell you the ones to follow in your particular circumstances. Despite the specific differences, however, there are similar general procedures that courts follow in most states.
Get the consent of both parents, if possible. If the parents agree that neither one of them is capable of raising the children, the best solution is for them to consent to have another person act as a guardian. However, when the parents are divorced, they may not agree about who should be the guardian. Even though it makes it easier, you don't need parental consent to establish guardianship.
File a petition for guardianship with the clerk of the court in the county where the children reside. Many states have forms that you can download and fill out.
Follow the rules and procedures of the court regarding guardianship cases. Since every state has its own procedure, the exact process differs greatly. Common things that courts order are interviews with the proposed guardian, parents and children; home visits by social workers; appointment of a guardian ad litem to act as a representative for the child and his or her best interests; examination of the proposed guardian's finances; and psychological counseling when appropriate. The exact process required by the court often depends on the unique circumstances of the case.
Establish that both parents are unfit to take care of the children. At some point, either at a hearing or trial, you will need to prove this to the court's satisfaction. "Unfit" is a legal term of art that basically means a child's parents are unwilling or incapable of meeting the child's basic needs. Because the parents are divorced, you need to prove that both of them are unfit. Common reasons to find a parent unfit include negligence, abuse, drug addiction and incarceration. Parents can also be declared unfit without being "bad" parents. For example, a parent on active military duty overseas may be currently incapable of caring for the child and thus unfit at the time.
Establish it is in the best interests of the child to have the proposed guardian granted legal guardianship. This requires that the guardian is a fit person to raise the child. It also usually means the guardian must have a close, personal relationship with the child. This is the final item a court considers when deciding whether or not to grant a guardianship request.