My 4-yr-old grandson, Ethan, is autistic. (I take care of him during the day.) He's had ABA instruction for two years now, and we recently have learned about RDI (Relationship Development Intervention). We're very enthusiastic about this program as it seems to provide the social aspect which is missing in ABA. His ABA therapist is learning along with us. My question is: Have any of you parents/caregivers had experience with this program, and if so, what are your opinions?