Aunt Corinne
An individual who doesn't contact you during your life, until after you visit your mother in hospice care and then informs you that your visitation was suspicious. In general a person who falsely accuses you of some wrongdoing especially at the most hurtful time. Also, an individual who will, for example, make a will for your mentally ill mother with a brain tumor that excludes you from the will. Alternatively, a general reference to someone who is cruel and heartless and doesn't apologize for their actions. Alternatively, an individual with a god complex.
Wow, that person is such an Aunt Corinne... Oh man, you were just Aunt Corinned I feel so sorry for you... ugh, I was just Aunt Corinned, I can't believe someone would do that...