Can the grandfather of a minor girl child act as a representative assessee under income tax act?

A 3 yr old girl child lost her father in accident. She is survived by her mother. There is a proposal for remarriage of her mother. She may stay with her grand parent after her mother’s remarriage. That, however, is not certain. A PAN application is to be made in her name immediately. Whether her grand father can become a representative assessee under income tax act, though her mother is alive?