Recently, I have been researching a family that was in Vanderburgh Co., IN, in the 1800s.
This family had immigrated from Germany (or that general area) in the mid-1800s. They had continued to reside in Vanderburgh Co. through the early 1900s.
At first, I thought that the family was the only family in their area with their last name. However, another family with the same name lived in the same area! And, the names of the children/grandchildren/parents were all the same as in the family that I was researching. Family2 had also immigrated from Germany about the same time as my research family.
It has been very important to sort-out the two families.
When you are researching your family, be sure that you are looking at records of YOUR family, and not another family with similar names and such.