My great grand parents were Krzysztof & Magdelana Meier. They lived in Łódź, Poland. I have an address for Meiers in 1930.
My grandparents, Arno & Julianna Hennig, had 6 children 3 boys and 3 girls.
I am trying to determine if any other family members have survived.
What resources can I utilize to determine if others survived?