If you are a parent, no one needs to ask what you care about the most. Children are always the priority of good parents, and that extends into a time after separation or divorce from a child's other parent. When it comes to decision making for a child's life, there are several reasons why a parent would want that power to themselves.
What are the types of custody?
Physical custody involves where a child spends time, and it is often divided up equitably if not evenly. For example, one parent may have custody during the week so a child may attend one school and the other parent has weekend rights. Legal custody involves the ability to make decisions regarding a child's upbringing, spiritual life and other vital matters.
Why would a parent sue for sole custody?
Any evidence or suspicion of physical or emotional abuse could be considered a good legal reason to change physical or legal custody at least temporarily during an investigation. Neglect of a child's needs during custodial time may also cause a revisit of custodial rights.
There are reasons beyond a parent's behavior with the child to seek sole custody. For example, if a parent suddenly becomes unavailable through incarceration or military service, sole custody may be awarded to the other parent. Permanent relocation would also trigger a new look at custody.
An experienced family law attorney can help parents claim child custody or negotiate with their co-parent for the best arrangement for their children. It's always wise to have legal representation if you go to family court.