Adoption

My uncle's estate was to go done among the family per stripes after his death. My parents adopted my sister's child. The family including my Uncle was against this and never recognized him as my parent's son but as their grandson being raised by the grandparents. Our mother died so when our great uncle died the money was to be given to mom's kids per stripes which my uncle told me meant to go to me and my sister not the adopted grandson which is my sister's son. He said that would not be according to per stripes because that would mean my sister's heirs would get more because the adopted child was her son. Therefore my uncle thought the per stripes would cover that. Was he wrong?

Can consent for adoption be revoked?

Can an adopted child’s biological relatives have visitation rights?

Can an adopted child make a claim to his/her birth parent’s property?

Is it legally possible for an adopted child get to know his/her birth parents?