This article is based on a qualitative research conducted with 13 young adults whose parents are separated. When they were children, some of these individuals have been heard by an actor of the legal system, such as a judge, a psychosocial expert or a lawyer in the context of the dispute between their parents over their custody. Some of them, however, have not been heard. The comparative analysis of these two forms of experience shows that the opinion of the participants is similar when it comes to their desire for involvement and participation in the dispute. Results show that children are more satisfied with the decision of the judge when they have been heard and when this decision is in line with their opinion. Some modes of participation tend to make the experience more positive. The bond of trust between the child and the legal practitioner, the neutrality of the latter and his interpersonal skills are essential for a satisfactory experience.