maybe trying genealogy. why not begin tracing your family history this way. and, in doing so, visit the towns they lived in and find out the history of those towns. if you can, locate the house(s) they lived in and visit the cemeteries where they are buried. see the churches and the schools where they attended, and possibly the places where they worked. this helps to get an understanding of what their lives were like. include any pictures of them you may be able to get ahold of in the history-and share this history with others.
as for your ancestors who were Mohawks--purchase books on the Mohawks and read and study about them. it will help you to discover what that family line was like too. and, for any of your ancestors who immigrated, if you are fortunate enough to visit their homeland, do so! enjoy it! eat some of the foods that are from that area and learn whatever you can about that culture.
I know first hand this really helps to connect you to your ancestors. since doing the genealogy of both our families, I have also had many of our ancestors visit me psychically--and I do continue to make contact with them. I speak to them when I look at their pictures and their history. I share it with the family members and have met many other family members we never knew about into our midst, who I now correspond with often.
I recall you mentioning finding out your friend was a cousin. that is so cool! she surely would be able to help by sharing her genealogy records with you and the two of you can perhaps go together to find more. it's always more fun when you have a partner to go with when exploring the cemteries, towns and records.
as for what tarot deck to use for this? I don't think any deck really matters. I believe any of them can help you to make a contact with an ancestor. there are many spreads for this purpose too. and, i'm sure you know meditating also helps.
but getting to really know them--through the towns they lived in, the jobs they had, the places they worshipped and the foods they ate really helps to find a connection to them. good luck! and , please share your findings with us. I always enjoy your posts, HC.