In general, I'm trying to expand the search for my family (JAKUBOWICZ) roots from Poland. We were in contact between late 1950s to late 1960s with our allegedly cousins who named also JAKUBOWiCZ and immigrated from Poland to Belgium - not sure if before or after WWII. I have the names of the father and his daughter who born ~ 1946. I have their address in Brussels for that period of contact. I hope with some key facts I could find regarding them to link between the families and know more about my great grandparents.
Of course renewing the contact with them will be a bonus.
Where do you think I should start?