Hi @gabriel. I work with my ancestors but my work is complicated. My mother was adopted so I do not know her side of the family. I additionally only know to my great grandmother on my dad’s mom’s side. Beyond that, it is a mystery. However, I have found that I am still able to honor and call on them when needed.
If you have not started with veneration, I suggest you start there before trying to call upon them for aid in a spell. They may come willingly without it but it establishes your relationship with them beforehand. There are many ways you can do this, from creating an altar to praying to them daily. I strongly recommend Honoring Your Ancestor: A Guide to Ancestral Veneration to anyone working with their ancestors.
From there, you can call upon them for aid just as you would a deity, elemental, or spirit. You will have to find the way to call/release that works with your ancestors, and it may differ between them. I have two sets of invocations/evocations and releases, as what works for my Irish/Scottish ancestors doesn’t work with my Portuguese ancestors.
Here are some additional forum posts that can guide you for calling on your ancestors:
I hope this helps!