i am sending tons and tons of hugs. it really sounds as if your parents are disengaging. that happens to a lot of people as they grow older and beware the people around them. I don't think there is a solution. I would stop buying presents since they only wound you. I think it would wound you to stop but wound you more to give. I know what it is like living with cruel parents. It all adds up. I was afraid to live alone with my parents. they could be so brutal.
I think you have to develop a strategy to erect some kind of wall even though it isn't pleasant. but they can really cut you, especially your father who seems the warmest. your mother seems so cold. can you search for things that soothe you?
Love
bobby