I would not hesitate to make "major changes" to any profile so long as:
1. I have the documentation to back it up. In my mind, that means enough to win in a civil court proceeding.
2. I collaborated. In other words, I posted that I see a problem, I have documentation to fix the problem and before I do the changes, I'm announcing it here. After 2-4 weeks, if no one squaks, I make the changes.
In the meantime, I improve the bio and source away.
In my opinion, disconnecting parents is not a major change it they are unsourced. Actually, that should be the default; no source = disconnect when there is a dissenting source .