I have now found out a bit of basic information about the birth place:
"Grünebach is situated in the District of Altenkirchen, Rheinland-Pfalz (= Bundesland of Rhineland-Palatinate)
This Region belonged during that time to the kingdom of Prussia. Today the village is part of the municipality of Betzdorf. Before 1886 Grünebach/Altenkirchen was part of the parish of Kirchen. The church records of Kirchen 1645-1927 are in possession of the Bistumsarchiv Trier (= Diocesan Archive in Trier)."
I'm still no further forward as far as actually finding/obtaining records and information on Frederick and other relatives, though at least this seems to be a step forward.

If anyone can provide any more information, help or advice that would be great.

ps ..
Berlin Bob where are you?
