OK, if i've got this right:sorry only secondary sources but I think I've found out who he was.
His grandfather was
Who at least had some dates and has a wikipedia page
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)
,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’."
Brother Nicholas who died in Rome
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