Helen's parents are deceased. Roselvr and I tracked down her siblings. They were told by a cousin that Helen made it safely to the place she was heading for when she ran away. They then told us what name she began using once she arrived there. In their words, they are totally content thinking Helen made it out alive, changed her name and simply does not wish to be contacted.
As her family,....it is her family's decision as to rather or not she is listed as a missing person. Unless she is listed in a MP data base, no DNA....no dental...no way to compare her with anybody.
The difference in your example is that you are a family member of your cousin. So far, we have not been able to convince any of Helen's family members to list her as missing.
Helen and her siblings were raised in a very abusive household. They do not wish to raise terrible memories. That is the reason Helen and her brother ran away together. WE have built a relationship with them and they are beginning to trust us, somewhat.
I am going to refer to Carl on this answer. My understanding is in order to consider a person, they have to be listed in one of the MP databases, or at the very least have a family member who acknowledges that person is indeed missing. At the current time we have neither.
Roselvr and I are still communicating with Helen's family. We are hoping that with time and patience they may change their minds and be willing to have her listed as missing. Doing so, or not doing so is their right, and theirs alone.
As a person that has a sister missing, I completely disagree with this statement. (there is no reason for a person to be missing, with family members alive and NOT be listed to be considered in a UP investigation.) My sister is ours, her photo's, her information, her memory. Everything about her belongs to us, her remaining siblings. ( Our parents are also deceased) Nobody has the right to take any part of her from us without our permission. No matter what their intentions, or how well meaning they are!!! In my sisters case we have her listed in all the data bases, That is our decision, and ours alone.No outsider has the right to step in and make that choice for us.
Lastly, I did not once say Helen could not be considered in any UP case, I stated a simple fact......until she is reported/listed as missing in one of the databases....until her family agrees to give DNA samples or her dental records.....or even better, both....there is no way to compare her with anybody.