In the 1870 census in Comal county Texas, there is Heinrich Luedeke 36, wife Elisabeth 39, children Anna 10, Herman 6, Albert 2. It notes that all came from Brunswick. I was not familiar with this name as a country of origin, so had to look it up. It seems that Brunswick is a version of Braunschweig, which is in northern Germany, the same as Mecklenburg. Perhaps the census taker made a mistake on the children's place of birth. I'm not sure if this is enough information to be of help in your search, or if it is even the same people you seek.