1) on father death make written application to landlord to issue rent receipts in mother name
2) enclose affidavit of other legal heirs that they have no objection of rent receipts being issued in mother name
3) ) under section 15 (d) of Mahrashtra rent act your mother would be a deemed tenant . if landlord refuses to accept your mother as tenant you would need court orders to direct landlord to transfer tenancy rights in your mother favour
4) also kindly clarify on what basis you had given it on rent to third party .
5) please note that you need landlord consent to sub let the premises
6) on road widening compensation would be divided between landlord and tenant