searching for surnames wendland,girndt, dickhoff,hartwig

searching for information on my grand parents otto wendland married to frieda dickhoff

my fathers side and fritz herman emil girndt married to luise frieda hartwig

my mothers side trying to find names of great grand parents

otto wendland had two sons heinz and bernard

fritz girndt had four girls vera ,waltrault,edith,gerda

otto and frieda lived in bornim kreis osthavelland

fritz and luise lived in berlin

any help greatly appreciated

frank wendland