Can I claim the expenses I incurred for my 33 year old daughter to attend a in house addition rehab program at an accredited rehab centre?

Yes, you can claim these expenses as medical expenses and they would be considered as attendant care.  Please see the following link for more information.

https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-return/completing-a-tax-return/deductions-credits-expenses/lines-330-331-eligible-medical-expenses-you-claim-on-your-tax-return/attendant-care-care-a-facility.html