Is it permissible for the brother who bought a portion of the land to give his deceased sister's parents 10 meters of the land he has not yet received, as compensation for their inheritance rights, after the husband's father tore up the original contract and wrote a new one in his own name?

The husband’s father committed a heinous act, and he must repent and return the rights to their rightful owners. As for the ten meters, they are part of the deceased wife’s property, and her legal heirs are more entitled to them. We alert the questioner that inheritance matters are complex and cannot be resolved merely by a fatwa (definition); rather, they must be brought before the Sharia (definition) courts.