There was never a leinholder on the title. We bought the truck, it was an all cash transaction so when we registered it, it and the title are in mine and my husband’s names. FIL said for us to pay him what we could when we could. We have paid him monthly through our credit unions bill pay service or via personal check. I have copies of the personal checks (when presented at the bank for payment). I could keep records of the bill pay ones too. I also have a balance sheet staying what days I paid him and how.
To my knowledge neither of his brothers know about the loan. They know we had one, but I don’t think they knew their dad was who held it.