There was just a post on this topic in another thread. :^)
https://discussions.scouting.org/t/merge-parent-mids/507200/4
The short form is that, if the parent isn’t able to put them under management themselves (as per your post), it is likely because of a mis-match between the PII in each Member ID. Council registrar will need to help with getting that sorted out. Both accounts should use full legal name, since that’s the least likely to cause issues (vs nicknames, with/without middle initials, etc).
