After observing physical traits and "looks" in my family, both sides, I have concluded that in my grandparents' generation, hard times called for desperate measures. I don't think it was unusual for a child to be conceived by someone other than the husband. Maybe the husband was aware, maybe he wasn't.
Both my grandmothers bore a child that did not look like its siblings in the least. And definitely not like Grandpa. I do know my maternal grandfather had to be gone for long periods of time, following the timber trade, and Grandma was left with a bunch of kids to support. What would she have done if a "better off" neighbor man asked her to do "work" for him? Her kids were hungry.
The other grandma actually left Grandpa for a few months. She bore a "not like the others" child after she came back home.
Just saying, getting a DNA test might open up a can of worms.
In my DH's family, DNA testing revealed a different branch of the family that probably caused the patriarch to roll over in his grave. Hehe!