Life time given free use of property for busines

hi every one, Can any one help to regarding my quary ? Matter is that father give a portion of his business premises for use of his Son's wife for her business purpose for life time. Father given that portion of property for life time to his daughter in law for rent free but any expenses related to said property used by her will be paid by her only. so my question is that whether i have to make a lease agreement of gif deed or any other legal documents ? whats its formalities and how much rupeee of stamp paper is needed for life time lease agreements? my id is " ca.mehulrchauhan@gmail.com