Sale deed cancellation and transfer to other name

My sister have property on her name before her marriage...after 9 year my father send notice to her tranfer the property on his(My father) name.other wise he will file a court case for this... He said in his notice:: 1)he gave money for this propert to my sister in 2010 2) some of money he gave in 2016 3) he said kabza unka hain...bas beti hone ke nate beti ko bolta aa raha hue...no property naam kar de..par nahi lag rahi hain...to mujhe(My father) notice send Karna pad raha h Plz help us Kya woh Aisha kuch court case kar sakte h property unke naam kar dega Kya court??