the will and the family's reaction

according to the will everything was put in parth's name to save his life..so then 5 years later why are nandini and karan not living with mihir and tulsi, isn't parth their son? why did they leave, it's understandable that gautam and sahil got pissed nd left nd damini and ganga had to go with their husbands, but shouldn't karan and nandini have supported tulsi and mihir considering EVERYTHING was done for their son, that didn't make sense. Also I understand they're trying to create a twist or suspense or whatever, but before when tulsi got kicked out and went to haridwar and found kt karan began hating mihir for what he did to his mom and he didn't forgive him because his mom was separated from him, so then why was it so easy for him to leave tulsi now..nd okay those three couples went off nd did their thing, where is mohini? she doesn't even have her husband where did she go live...and what is the point of introducing a new girl as tulsi's shadow when kt was there from the beginning of the previous leap as her shadow which was why she had the name krishnaTULSI im honestly confused...