I have been working on Family history for some time and have a Brick Wall in Amstedam, My grand mother is said to have been born in AMSTERDAM. Gertrude SCHIPPER. She is daughter of a Martinus SCHIPPER who married an Aletta SMIT

Martinus SCHIPPER b. about 1868 of Amsterdam d. Netherlads
married abt 1894 to Aleta Smit b. March 9 1868 or (1868) may have been born in Nijpe, Noord Holland. Childern
William SCHIPPER b. March 22, 1895
Gertrude SCHIPPER b. July 13 1896
Marie SCHIPPER b. July 1898
Loreta VANDER KOMP relationship not known

Can anyone help.