Right on property for other family members

Mother, 1 son, 2 daughter; My father has expired without any will (Hindu Family) (none of the below properties are ancestral, self acquired by my father only. no ancestral property. Property 'A' is in the name of my father self purchased by my father. who all will get share (Mother, , Son, 2 Daughters) -- my father already did partition with their brothers & sisters in 1980's before purchase of these properties, and did not receive any immovable properties as part of partition, but received 5000 Rs at that time. Property 'B' is registered in son's Name purchased directly from outsiders through sale deed.- but with fathers money Property 'C' is registered in mothers Name purchased directly from outsiders- partially with mothers and fathers money. My other Sister has filed a partition suite on my mother, Brother and me in karnataka stating that all the properties A,B,C,D are purchased by my father money so she needs share on all the properties. -- We have file a response showing proofs of purchase and income for my mother, and also showed the debts of my father and the amount given to my sister for her marriage. what is the likely case to happen in these types of cases and how to proceed further. they (mother and brother) are willing to share the fathers property by 4 parts, but not the properties in the name of my mother and brother. how likely is my other sister able to succeed in this case.