Am I the only one who is finding this track better than the one they had originally planned? I know it's OTT and not particularly interesting. But there is a hope that few things in MU and separation may be justified due to Virat's current absence. I was dreading what flimsy lead-up they were going to show for the MU in the original plot.
As far as the family's criminality is concerned, as @notaquitter said, they have already committed the grave crime of separating the grandchild from their daughter and rendered their daughter mentally ill. If they can do all that, kidnapping will not seem like a big deal to them.