No one can say with certainty how a judge would respond but in general, the request to have the children for 8 weeks straight without your being able to see them during such time seems excessive and especially since there will be a new Adult introduced into their day to day lives with whom they may not get along.
You do not have to go to Court to demand that the Summer vacation be split into 2-3 week intervals.
Tell the mediator you refuse to consent to 8 straight weeks. If for some reason you are unable to resolve the matter in mediation,
you should request that an arbitrator be appointed for this one issue and have him hear both sides and decide.
Leonard M. Weiner, Esq./ Divorce Solutions