Yes thank you Patricia, I did have this information; Michael and Charlotte do not appear in the 1880 census near as I can tell. As you said, Michael's age is impossible to decipher on the manifest. If this is the right family, Johann born 1835 would be my gg-granduncle, brother to one Johannah Dolnick who married Albert Auguste Mischke. My gggrandparents. Either that, or he is Johannah's uncle too. Without definite parents for Bertha (Charlotte could indeed be her mother), I'm kinda stuck!