Are you eligible to claim the amount for infirm dependants age 18 or older (line 306)?

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Did you or your spouse or common-law partner have a dependant that met all of the following conditions?

The person was:

your or your spouse's or common-law partner's parent, grandparent, brother, sister, aunt, uncle, niece, or nephew
born in 1998 or earlier and had an impairment in physical or mental functions
dependent on you, or on you and others, for support
a resident of Canada at any time in the year. You cannot claim this amount for a person who was only visiting you

A parent includes someone on whom you were completely dependent and who had custody and control of you when you were under 19 years of age.

A child can include someone older than you who has become completely dependent on you for support and over whom you have custody and control.