Not all men who are told that they are a child’s father agree with the mother. Even if they agree, they will still need to take legal steps to be granted rights. Determining who a child’s father is can be critical for several reasons, aside from obtaining legal rights. For example, a family’s medical history can be critical when it comes to the birth of a child. Genetic diseases can be inherited and affect a child’s health. This is just one of the reasons that establishing paternity can be a necessity.