Out of curiosity; did our ancestors make peace with the fact that our(men) kids might not be ours after all?

In many Nigerian languages we call our siblings "child(ren) of my mother" and not "child(ren) of my father" despite the fact that our custom says children belong to the father.
This might mean they were sure of the mother of the children but were in doubt of who the father was.

I present you with three(3) examples of how we call siblings;
Igala of kogi state says "óma-iye mi"
Yoruba of south west says "omo-iya mi"
Igbo of south east says "nwa-une'm"
All the above literally mean "child of my mother"

What do you call sibling (sister/brother) in your native language and what is the literal translation?

Did our ancestors make peace with the fact that our(men) kids might not be ours after all?