Always keep open to the possibility that your relative and a contemporary may have had more than one relationship. Just because you’ve figured out a connection does not mean that there were not others. Second cousins could have been in-laws. Step-siblings could have been cousins. Individuals who were related because their mothers were sisters could have had fathers who were also first cousins. Never assume that because you have one relationship figured out that there could not be another one. It may be that the second relationship is the one that yields more genealogical information or helps to explain things about your relative that don’t quite make sense.