searching for info on Father Max Johann Franke

I am looking for information on my father, Max Johann Franke. He was born September 1, 1896 in Berlin. My Familien Stammbuch gives "registry office : 8 Berlin nt 198" for him. His parents had their marriage registered in the same office May 5th, 1897 nt 369. I always heard that he had a sister.
My stammbuch gives his Mother's name and family name... but I don't speak German and the handwriting style almost looks Polish!!
So any additional information would be wonderful!! Thank you!