Disability tax credit amount for 2020 is $8,576 as non-refundable credit ($8,416 in 2019), with a supplement up to $5,003 for those under 18 (the amount is reduced if child care expenses are claimed; $4,909 in 2019
All individuals who has such disabilities or has a family member with it, can get the form 2201 (link below) signed by their family doctor and use it in personal tax return. please follow the link here for the list of disabilities subjected to this credit. : https://disabilitycreditconsultants.ca/conditions-eligible-for-disability-tax-credit/
T2201 form link: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/t2201/t2201-18e.pdf