1. Once an adoption is validly made then the adopted losses ll his rights of inheritance from the his previous parent.
2. Since the child was readopted and if the re adoption was validly executed then he losses all his rights from his parents who gave him in adoption and gets entitled to all rights form his resent adoptive parents.
3. In other words He will inherit from the youngest son only and not from the elder son anymore.
4. s the elder son does before the second adoption of the child, he has already inherited from his father i.e.elder son as he was still his child then.
5. So the inheritance of the child from the elder son can not be stopped since the inheritance opened to him on the date when his previous died which was before the date of his second adoption.