My story is a bit different I guess regarding to communicating with the dead.
I am from a heavily devout Christian family, so you can already tell that speaking or messing with the dead is considered a sin/abomination.
My grandmother can see and speak to the dead, as do one of her sisters, her mother, and her own grandmother and beyond. Though my mother is unable to see or speak to the dead, my uncle can see them only and I at a very young age have been able to communicate and feel them, but not see (I can witness an image in a mirror for a moment however).
My grandmother had been sort of like a mentor to me. I'm unaware if she had dealt with necromancy but she taught me about what she knew and forbid me from strengthening or moving along in life with my abilities due to our religion.
We have a tendency to attract demons, or bad spirits, so my grandmother used to do ritual stuff around the house to ward them off and taught me how to do it. We used to turn mirrors so I won't witness one and she'd stay up at night to make sure I slept well.
Growing up, my senses have been extremely strong. I can feel spirits to the point that my body gets shaken and I need to lie down or great fear rises inside of me. I've also grown a fear for mirrors now, because I'm afraid I'll see a spirit that isn't so benevolent.
My family associates speaking to the dead with witchcraft, especially since my grandma always did strange ritual stuff, but I don't think we really comprise of ancestors that were traditional witches.
Whenever I look into speaking to the dead now at 17, mirrors fall, car alarms go off, everything in the house goes into chaos. As a result I have been forbidden by my mother to try to communicate to the dead. I don't know if our ability is just very strong to beckon spirits, or we are cursed. Even if frowned upon by Christianity, I want to be able to utilize my ability somehow passed down from my bloodline without causing havoc in my home.
In fact it happened again yesterday when I looked into it. It was 1 am and another of our mirrors broke and some of my neighbors woke up from the cars going off for no reason outside, and the house alarm was arming and disarming itself nonstop.
I'm at the point where I feel afraid of what I've been born with, and that is maybe why my mother and grandmother warned me about getting into this.