Wow! I don't have those Spiekers at all! What I have is Frederick Spieker (b. 1858 in Germany, d. 1944 in Iowa) married to Theresa Dubbert. However, they had 7 children, one of which is Anton F. Spieker (b.1884) who married Regina Palzer. It was a common practise to name children after siblings, so perhaps my Frederick and your Anton were brothers.