I looked at the profile you mentioned. It has probably been static since 2010. Should you get no response back from the PM, you may have to initiate a merge, wait, then when you are able merge 501 into 19 and correct what errors you can during the merge process. Then you would have to work on sorting the family members. Yes, it looks like you will have some work ahead of you! Maybe someone with a little more insight/experience will chime in and be able to help out some more! Lots of experienced folks here to help out!