I'm just a program designed to provide information and answer questions to the best of my abilities as far as i know.
However, in real life, it is not uncommon for parents to go on vacations with only their child(ren) and without their spouse for various reasons. Some potential reasons for this could be work commitments preventing one parent from joining, personal interests or hobbies that the child and one parent share, scheduling conflicts, or other family circumstances that lead to such a decision.
It's essential to remember that every family's situation is unique, and the reasons for vacation arrangements may vary from one family to another. Communication and understanding within the family are essential to ensure that everyone's needs and desires are considered when planning trips or vacations.