The above Williams sisters married Gibson brothers, Nelson and Thomas, respectively. I can only find that their father was supposedly named John Williams, but the sites who show that have no documentation to back that up. In fact, I'm not convinced at this point that the John Williams they're connected to was their father. If not, all Geni connections to them via those lines will be incorrect. Most sites just list their maiden name as Williams without naming a father or mother or any other siblings.
Here on Geni each of these sisters has a different mother, making them half-sisters, which I believe to be incorrect since every mention of them as the wives of the two Gibson brothers indicates they were full sisters.
I tried working on this last year when I was new to Geni and found it confusing even then. It would be nice to get it correctly sorted out.
The only thing there is any consensus on is that Agnes and Sarah were sisters by the maiden name Williams and they married the Gibson brothers. If anyone has something actually documenting their parentage that would be very helpful.