Want to find a person

Help needed with filling in the blanks

Hello,
I am looking to fill in the blanks in my family tree, the person that I am interested in is:-
Franz Dudek
Who would be my Great grandfather
Born abt 1850
Death 13th February 1888 in Colonie Neudorf, Nieder Schwircklau, Rybnik, Slaskie, Poland
Marriage to Johanna Nogla (born abt 1850 in Gogolova, died 31st March 1905 in Dolne Świerklany)
Who were their parents
Did they have any siblings
Did they have any children apart from Joseph (b 28th February 1876 in Nieder Schwircklau, Rybnik, Slaskie, Poland)
Regards - Hans

I guess they could know alot more about the past member of this parish:
(if you don't have already)

swierklany.com.pl/

pl.wikipedia.org/wiki/%C5%9Awierklany_Dolne

Good luck! :)

Many thanks for the links
Hans