1) since your parent is your dependent, then yes, the medical expenses can list claimed as itemized deductions.
please read this article;
https://ttlc.intuit.com/community/credits-and-deductions/help/what-is-the-child-and-dependent-care-c...
there are other requirements for taking the dependent care credit - for example, were you and your spouse working? if no, then you are not eligible for the credit. Did he live with you for at least 6 months of the year - if he was at a group home for at least 6 months, doesn't appear you are eligible for this credit.
