If your father has any share in the property now under question, it is to be seen that how did he acquired the same,. whether by inheritance or self acquired or whether it devolved on him through any other mode, i.e., inheritance of ancestral property.
Whatever be the issue, if he is considered as an absolute owner of any property, he can transfer the same to you by a registered settlement or sale deed after which you can become owner of the share of property so transferred to your name.
You cannot acquire the property that belongs to a third person without his consent or being transferred by that person in your favor.
Your father's brother may be missing, but his property cannot be acquired by you. His own legal heirs only can take steps to acquire the property that belongs to him by due process of law.
Your father's grandmother's share of property also cannot be acquired by you, she has to execute a registered gift or sale deed in your favor in respect of property that belongs to her after which you can become absolute owner of that share of property.
Please remember that patta is not a title document and no bank will sanction loan on the basis of patta.