Kindergarten issues with Autism

Well my son is adjusting better but has had to be switched to a different schedule then another child due to personality issues. He is having good success in this split school model where he spends first half of the day in Sped and second half in half day kindergarten. He loves math and art along with his teachers. We still can not get him to potty train but have not had a stinky accident in 4 weeks yeah!!! His faithful sister goes every day to take him to the bathroom and make him change his pants if he is to wet bless her caring soul.