There is not a credit but an increase to the Standard Deduction for your filing status. If he is age 65 or older and blind then he will get an increase for both
Standard deductions for 2023
Single - $13,850 add $1,850 if age 65 or older or blind
Married Filing Separately - $13,850 add $1,500 if age 65 or older or blind
Married Filing Jointly - $27,700 add $1,500 for each spouse age 65 or older or blind
Head of Household - $20,800 add $1,850 if age 65 or older or blind
