Need some help on the medical expenses claim

It depends.

You would only be able to claim medical expenses if your parents are considered your dependents or your medical dependents. (Please note that in order to claim them as dependents or medical dependents, they must be U.S. citizens or nationals or residents of the United States, Canada, or Mexico.)

An individual must meet all 4 of these requirements in order to be considered your Qualifying Relative:

1. Not a Qualifying Child: The individual cannot be your Qualifying Child and cannot be someone else's Qualifying Child. They are a Qualifying Child if they meet all the requirements, whether or not they are claimed as a dependent
2. Relationship: The person must either have lived with you for the entire year as a member of the household (a person who is not actually related to you may meet the requirements in this way), or be related to you in one of the following ways: your child, stepchild, grandchild or other descendant of one of your children (or stepchildren or foster children), son-in-law, daughter-in-law, brother, sister, half brother, half sister, stepbrother, stepsister, brother-in-law, sister-in-law, parent, stepfather, stepmother, father-in-law, mother-in-law, grandparent, and, if related by blood, aunt, uncle, niece, or nephew. Remember that a child whom you legally adopted is always considered to be your child. Also note that, for the purposes of this requirement, divorce or death does not change any relationship which was established by marriage (e.g. son-in-law, daughter-in-law, etc.)
3. Gross Income: The person must have made less than $4,000 in gross income during 2016.
4. Support: You must have provided more than half of the individual's total support during the year.

You can include medical expenses you paid for an individual that would have been your dependent except that:

Click this link for more additional information about claiming elderly parents as dependents