This may seem an odd and morbid question, but I am curious about the use of relative familial titles when the family member you are referring to died prior to your birth.
For example, say my mother has a brother named Bruce. When I am born he becomes my uncle. While we are both alive I would refer to him as Uncle Bruce. Even when he dies, I would continue to refer to him as Uncle Bruce, as in, "Remember the time we went to the beach with Uncle Bruce?" Moreover, I would argue this title stays even after my death. My children might say, "My dad's uncle was a shoe salesman."
But how would I refer to my mother's brother Bruce if he died before I was born? I would think I would refer to him as "my mother's brother." It seems odd to refer to him as my uncle because he was not alive when I was born, therefore he only attained that title posthumously.
And would it make any difference as to when my mother's brother died? Say my mother had a brother who died when he was an infant. Would he still be referred to as "my uncle?"