Inheritance Rights Of Children Of Incest/illegitimate

Can illegitimate children born to incest claim inheritance from their biological father or mother. The mother in question gave birth to a son, who was given away for fostering within the extended family informally (so there are no adoption papers formally). Now, the son is 35 and the biological mother has recently expired. The biological father has also expired. The biological uncle (biological father's brother) is now trying to steal (by copying the sign, or by claiming that no rightful heirs exist), the mother's land (from her second marriage). The strategy is that as a child of fornication and (Muslim but born to a Hindu mother who later converted to Islam), he would not be able to expose the truth for social awkwardness. If he claims, can he claim ownership of property?