Where do I claim for the disability tax credit for my son? He is 12 years old. I have a t2201 on file.

After you've entered your son as a Dependant and completed the Additional Dependant Information section (Deductions tab), enter the disability transfer information in the Claims for Dependants section (Deductions tab - Claims for Dependants - Disability Amount transfer).

https://turbotax.community.intuit.ca/replies/3293463