Children who are exposed to their parents' arguments often blame themselves for the fights of their parents. Parents need to be particularity sensitive to their children and keep them out of their adult conflicts. The reasons people have for ending their relationships are not reasons for children to change their relationship with their parents. Each parent has a responsibility to ensure that their children are encouraged to just be children and enjoy childhood with each parent. The most important single thing parents can do for their children is resolve their conflicts and cooperate in parenting their children.
Research shows that children adjust well to all types of parenting arrangements.
Therefore it makes little difference how the parents decide to share or divide parental rights and responsibilities. What is important is to keep the children out of whatever conflict the parents have with each other. The one factor that seems to predict problems for children that may even extend into their adulthood is unresolved conflict. Children do not adjust well to life when their parents continue their conflicts after the relationship is ended. There are occasions when one parent's behavior with a child places the child at risk.