I do not know about Dr. Kamat, but in OG Kaushiki’s biological father was main culprit who did scam and made Tarini’s mom to commit suicide.
Tarini exposes the truth by sting operation. Kaoushiki was adopted in khandekar family. When she gets to know the truth she stays loyal to family than favoring her biological father
Kaushiki is adopted 
इकडे तर Dr Kamat villain असेल अशा hints मिळत आहेत let's see
My theory is that Dr Kamat and Padmini had secret love affair and UV is their son that's why Dr Kamat is always tolerating UV's insults 
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