The money would have been life-changing': My father told my grandmother to slash my inheritance. Is that fair?

A letter to Quentin centers on a family inheritance dispute involving a grandmother’s will change. The writer says their father persuaded their grandmother to revise a plan that originally left one-third of her estate to each of the two grandchildren and the father’s perspective that inheritances should go only to children, not grandchildren. As a result, the writer and their brother would each receive 10% instead of an estimated after-tax $300,000 apiece under the original arrangement. The writer alleges financial harm tied to long-running resentment, including loans taken out for college without disclosure and medical bills allowed to accumulate under their name. They say they repaid more than $130,000 at 11% interest and now saved over $500,000. The correspondent seeks guidance on how to advocate for restoring at least part of the original shares without escalating conflict.