My son is elgible for DTC and he can correct by going back to past 10 years. He is 20 now and has been living in QC,Canada. What are the benefits we are elegible on Quebec side for the past 10 years

Hello My son 20 years now is qualified for Disability tax credit. He can go back and adjust from past 10 years. We live in Quebec, Canada all the years. What are the benefit i can claim from past 10 years on Quebec side