Inheritance of Property

Hello, My father had following properties: 1) One residential property at Rohtak (Haryana) 2) One residential Property in joint name with my mother at Jind (Haryana) He died in 2009 without any will. He had following legal heirs : 1) Wife 2) Son 3) Daughter (married) Till date property ownership is not transferred to anyone's name. Now my mother lives with me at Ghaziabad. She is 70years old and has limited movement. I and my sister want to transfer both properties in my mother's name. Also, I am planning to purchase a new property at Ghaziabad in her name. And she wants to make a will. So can I do the following: 1) Get her will executed at Ghaziabad 2) Get a POA executed in my name, where I can sign on all kind of documents on her behalf. Whether a registered general POA and Will executed at Ghaziabad will be acceptable at Haryana as well. Thanks