Yes, if you are named as the Guardian Ad Litem (GAL), in most cases, you have to attend the court hearing; and the minor child is not required per se to attend the hearing, but with my San Diego personal injury law practice, I always urge the parents to bring the child for the following reasons: 

1. it makes it easier to acquire court approval of the settlement since the judge gets to meet the child, and ask he or she questions about the accident and injuries, if necessary; and,

2. depending on the age of the child, it can make the understanding of the process to the minor child easier (remember, these funds are for the benefit of the child and if they are a teenager, attending the court hearing can impress upon them what is going on and the importance of the settlement funds).