my father got this property from his mother in law ,when she was alive ,but it was not registered deed by oral saying my father got MIL land ,
daughters from first wife of my father claiming the share now
my father passed away one year back
he did will in 2009 in the name of sons and his second wife
he didnt mention his daughters name
The problem in this acquisition is that the so called mother in law should be the mother of your father's first wife who would have transferred the same orlly to your father for the benefit of her grand daughters owing to her own daughter's death.
Moreover this seems to be an oral transfer, your father never acquired the property legally on his name hence he may not have marketable title to the property now bequeathed through the will.
Thus the bequest made may not be legally valid and the property shall belong to your step sisters if the legal heirs of your father's mother in law do not have any objection to it.
In this situation, it will be better to arrive at a compromise with your step sisters and give them a share in the property ignoring the will or the bequest made therein and settle the matter amicably.
If they go to the court, the decision may be in their favor too, so think about all pros and cons before denying them their shares in the property.