Father rights on child property

Kindly check agreement with builder, if the builder has executed the agreement with your mother and your mother has raised loan than your mother has right, title and interest in the property and your mother can deal with the property.

regards.

First, U see the AGREEMENT (whose name mention in document)  AND thereafter u contact local lawyer.

No agreement or bond being executed between my mom and the builder, we just approached the builder he built it for us, he came through my father reference. She raised the loan with the bank and she paid off the money and closed the loan also. 

Kindly let me know my father is saying that its illegal to change the property to our name without his consent or permission, is it worthy to argue like this.

Which agreement you are talking about. 

As there was no agreement executed at that time, my father can create a duplicate agreement with the help of the builder now.

U contact Bank and u search that loan pass by Bank on which doucuments. Receipt of Payment, Possession Letter, Allotment Letter, No Due Certificate, No Objection Certificate etc........ Please check it.

Ok will do that.

Kindly make me clear that, the property is in my mothers name, can she change that to our name.

Nisha,

In whose name the property is registered? If it was registed in your mother's name and there after your's and your brother's, then your father has no legal right over the property. 
Even if he claims that he had spent money on renovations, only claim he has on the property is for renovation money that too if proofs are there.