Urvashi was a naagin but have to search Google about kenchuli in previous episode.
Manyata get punished for marrying human and lose power for 25 years but Pratha's grandmother have no problem with her daughter marrying a human and Pratha's mother didn't lose her power.
Yash is a naag but his younger sister Samaira is not a naagin. Naag and naagin take revenge for their loved one but Yash didn't take revenge for Samaira.