Is it possible to get register entire land on my name ?
There is a limit for greediness.
As you said that it was your father's ancestral property and as your father died intestate your mother transferred them on her name, if this is true then your mother's act is illegal and invalid.
The ancestral property in the hands of your father shall again be divided into three parts, while one part or share to be retained by your father as his share the other two shares shall be inherited by you and your brother.
This is the actual distribution of your father's share in the said ancestral propriety in his hands.
Since your father expired in the year 1994, your sisters do not have any rights in the major divisor of the property into three parts.
Your mother has no rights in the property at all for any share hence the transfer of property on her name is illegal and invalid.
Now coming to your father's own share after the entire property was divided into three parts.
Your father's share i.e., the 1/3rd share of the property shall again devolve on his own legal heirs consisting his wife and all children.
i.e., upon his intestate death your father's 1/3 rd share in the property again be divided into four parts and you shall be entitled to one such equal share.
Thus your entitlement in the property shall be 1/3rd share and 1/4th of 1/3rd.
Your brother shall be entitled to a share to the effect of your entitlement.
Your mother and sister shall be entitled to 1/4th share each.
Hope you understand the legal position of partition/distribution of your father's property