Do I have a right or would it do any good to contest a will?

My grandfather passed and his middle son is the executor and POA. Out my grandfathers three children only two are living and there are only two grandchildren. My father has passed and the Will that the son is using is from 1998. My grandfather has updated his Will since then but we can not find the Will or the attorney he used. The remaining two sons cleared the house out before any other family could enter it. The new will supposedly wrote the POA/executor out of the Will because he had a huge fight with my grandfather. We have no proof that the 1998 will isn’t the most current will. Would it do any good to contest or would it be a waste of money. The 1998 Will indicates that it would be split between the three sons unless one dies and the remaining would be split between the remaining sons. That excludes us bc my father has passed.