House share problem

My Maternal grandma have 2 daughters. My mom is the younger one. And im her only daughter and my mom's elder sister have one son. My Maternal grandma bought a house which my Paternal grandpa was residing for past 20 yrs due to financial problem which they had on that time. My Maternal Grandma, grandpa, me, mom and Dad Were Living Together In That House. On Her Own Good Will, she Gave That HOuse To My Mom as a gift deed For Taking Care Of both Of Them In Their Old Ages Before She Passes Away. And Legally that House Was Registered In My Mom's name. Property tax and water tax has been changed to my mom's name. My Question Is That , do my Mom's Elder Sister Or Her Son Have Rights On That House ? ! because Right Now We Are Planning To Sell That House due to One Financial Urgency. While selling Will we Face Any Legal Problems From My Mom's Elder Sister Side? ! In Case, How We Can Deal ? And What Sort Of Problems They Can Arise ? ! Looking Forward for Your opinions. Thanks In Advance