Searching Kaeselau-family story

[BretenBryden&OdinSmith]

Please help. Does anyone know about the parents and roots of our grandparents Albertina Bergstrom b.13 oct 1857 in Stockholm and her husband Jean Kaeselau ??
And what happened to our grandfathers sibblings?
Their names are: Jean Friedrich b 1877, Elisabeth b. 1878, Alma b. 1880, Olga b 1884  ( we just got information that she married in 1924) and at last Albert b 1888.
We hope to get some clues here so we may be able to put up our swedish family-tree before it's to late and  they all are forgotten.
Thank you. Breten & Odin