According to the Hebrew entry in Wikipedia for Rabbi Yisrael Abba CITRON
(also KITRONI), the Rabbi of Petach Tikva in the years 1911-1929, he was a
descendant of Rabbi Rafael Ziskind HACOHEN of Hamburg.
Yisrael Abba CITRON was the brother of Leah CITRON BRODNY, great-grandmother
of my wife.
I will be grateful if any member of this forum who has a connection to
Rabbi Rafael Ziskind HACOHEN of Hamburg will contact me.