You may be able to claim one or more credits when an elderly parent lives with you. If you are not married or have a common law spouse, or have a child under 18, you can claim a credit for an eligible dependent if your parent was dependent on you for reasons of physical or mental infirmity. The credit is reduced by the income of the dependent parent.
You may also have a claim to your parent’s disability credit if it is not needed by your parent to reduce their taxes.
You may also be able to claim medical expenses of your parent. Medical expenses must be greater than the lesser of 3% of their net income and $2,237.