The information I have on Martin and Gesina Tjaden is this, in the 1885 census in German township Grundy county Iowa ,they were living with a Freek Ter Fehn, who was Gesina father . I guess the name was spelled two ways, Ter Veen and Ter Fehn Martin was listed as a sailor as an occupation He died in 1886 or 87 survived by his wife Gesina and four children in 1890 she married Gerd Schutjer who was my greatfather, Gesina died in 1920 and is buried with Martin in the cemetery at St Peters Luthern church in German twp in Grundy co. It is now called St Peters U C C The daughter . Bertha married Hanko or Henry the youngest son of Gerd Schutjer in 1895 They later moved to the Brookings S Dak.orCanby Minn area
Hope this helps
Richard Mennen
richdixie@netconx.net