>     .. for a person who is in the below described relationship with a
>     scion of a noble or wealthy-and-socially-prominent line:

Pedagogue. Tutor. Proctor. Didact.

In my TU, a single person alone might serve in this role for low-level, or poor,
Noble families, or in wannabe Noble families. More senior, or richer, families
would likely have a team of people performing this function, each person with
a set of skills, some overlapping. My Noble bodyguards are pair-bonded to their
masters/mistresses from childhood. (I summarized this for one of my players as
'She is your sister. You are her god.')

I suggest that this would be a prestigious position, possibly associated with
mental conditioning (cf the Suk School in Dune). After all, they are basically
training the next generation of leaders. You probably don't want J Random Loony
in such a position...

Jonathan