Sometimes, biological parents are not in a fit state to take care of their dependent children. This could be due to many factors including mental illness, drug or alcohol addiction or the fact that they are serving a prison sentence. Children whose parents are unable to adequately care for them may have to enter the foster care system. However, a great alternative to this is if another family member, for example a grandparent or grandparents, can take full custody of them instead.
Relatively recently (in the last 40 years) has it been a right as a grandparent to be able to seek to visit a child. Now, every state had a legal stance on visitation rights for grandparents and other non-parental relations.