Deduction for medical and surgery expenditure

My aunty, not senior citizen, was operated for her knee replacement in FY 2021-2022. My uncle received less amount as mediclaim reimbursement than expended (about 150000/-)
Uncle also has senior citizen mother who is dependent on uncle and has some knee issues and cannot walk without support. Uncle incurres lot of medical expenditure for her her regular checkup and medicines (about 50000/- in this year).
Query is, how uncle can claim deduction for these expenditures under 80DDB separately (totalling to 200000/-)? Or which section?