OK, if i've got this right:sorry only secondary sources but I think I've found out who he was.
His grandfather was
https://www.wikitree.com/wiki/Fitzherbert-25
Who at least had some dates and has a wikipedia page
https://en.wikipedia.org/wiki/Anthony_Fitzherbert
His father John Fitzherbert was a recusant living at Padley. Derbyshire. He He was betrayed by his son Thomas and spent the rest of his life in prison. (the two priests present were executed)
http://places.wishful-thinking.org.uk/DBY/NetherPadley/PadleyChapelAJ.html
,See also the bio of his treacherous son, Thomas who was an MP https://www.historyofparliamentonline.org/volume/1558-1603/member/fitzherbert-thomas-1550-1600 This tells us one thing about George
"His younger brothers were, according to Topcliffe, ‘Nicholas at Rome’, guilty of ‘horrible treasons’; ‘Francis, a friar; George, a Jesuit; and Anthony, a traitorous felon’."
See also
Brother Nicholas who died in Rome
https://en.wikisource.org/wiki/Fitzherbert,_Nicholas_(DNB00)
The Visitation of Derbyshire,however doesn't have a George at all https://babel.hathitrust.org/cgi/pt?id=uc1.c2524486;view=1up;seq=49