Adopted son share in property

Since adoption was complete you will have equal share in adoptive father's (not in natural father's) property with other siblings of your adoptive father.

As per you, your adopted sisters have challenged your adoption and they lost the case, it means your adoption has been held valid. Therefore you are entitled to equal share in the property as other legal heirs to your adopted father.

Mr Pandey, as you have said about your adoption to have been challenged by your sister, who has already lost her case, justifying your valid adoption, so, it's no doubt to be entitled to be getting equal share in the property as other siblings to your adoptive father