While it’s always advised to research extended family, the reality is that there simply is only so much time one can devote to certain problems. That said, why would one look at the US passport of an ancestral sister-in-law in the 1920s?
Because during that time period some women still derived their citizenship through their husband and knowing something about the passports issued during that time as well, I know that there’s a good chance the ancestral sister-in-law’s passport mentioned her husband.
And he’s the brother of the ancestor.
And that may help me on my actual problem.
Sometimes records on the in-laws are more likely to be of immediate assistance than others. And while an exhaustive search is always good…we all have limitations.