gautami is actually negative and hired by mandira who has the real tulsi (smriti irani) kidnapped and forced her to teach gautami everything because mandira has nandini and karans kid...mihir probably found out about this from sumone while he was in jail (lol happens alllll the time đ) and confronted them and they told him to be negative to the point where all the kids start hating him and take the fake tulsi's side and that once he was out of the house and had the property half and half between mandira and fake tulsi or did some other thing in their favor they whud give bak the kid...it sounds complicated but its an ekta drama and anything can happen, also it's the best way to bring bak smriti...