Dividation in ancestral property

Mr. Ram is land(ancestral property) owner and remarried after his first wife death. From the side of first wife there r 3 child and from the 2nd wife(alive presently) there r 1 child... Then how Mr. Ram property will divide after his death. And Mr. Ram what can do a will in favor of any child.... Modified.. Suggest pls

The proper shall be divided in five equal portion to be divided equally amopung four children and second wife.

Mr.Ram is having ancestral property but how?  whether is it by partition among the legal heirs of his father?   because, only the property inherited by a Hindu from anyone of the three immediate paternal ancestors is called as ancestral property.