Why do i have a problem deleting dead people's contatcs.

Now I’m afraid of losing them. Digitaly

I recorded my sister`s voice mail message when she passed. She sounds exactly like my Mom, also.
If I ever forget what they sounded like, I have a sample.
Its been 8 years for both of them and I haven`t listened to it yet, I`d probably start bawling...tearing up now.
I saved my Dad's cassette home answer tape. Used to help/ hurt . But Always did me better after, I think....