Hi, 1046 ...
I don't think so. I've been using Context Reverso ... they have a database of translated texts (many of them TV shows) that you can search for occurrences of any phrase, and they give you a break down of how it was translated, and how often each variant came up.
I tried 'friends and relatives', and it comes up with Freunden und Verwandten, no mention of Beziehung(en).
It seems to mean relation as in relationship, not as in relative.
I'd encourage you to play with Context Reverso - it can be a great help.