Yakov Tessler family tree

He was my great uncle by marriage to his wife Teresa, who was one of my grandmother's (Estee Florenthal) sisters.
They had lived in Transilvanya and moved to Romania at the time the Germans put this area under the Hungarian rule in 1944.
Later they emmigrated to Israel, where they have lived with the family until their death. I learned recently that Yakov, or Yokob, had also been a cousin of my grandfather Yaakov Florenthal from Cluj.
I am looking for any information leading to his parents, siblings, cousins etc. who might have been my relateives.
I'll be grateful If anyone is willing to share those details with me,