I assumed Rueben died in Grant Co since he and Belle marriedthere, lived there 1900 census, owned land there, and is buried in Sheridan Cemetery in Grant Co AR, so I was a little surprised when you said he died in Saline Co, but I haven't done extensive research on them either.
My great aunt, daughter of Cornelia Slaughter and William Breazeal(my greatgrandparents), mentioned these names in 1954:Lottie, Etta Lee, Mattie, Belle, and Alice.Last year the granddaughter of Robert N Slaughter said these girls were daughters of Robert N, brother of Cornelia. So, I do not have proof in black & white, just word of mouth from family about Belle's parents.If you find definite proof otherwise, I will surely appreciate your offer of sharing. I do not have a Nathaniel Slaughter.Now I'm wondering who he is.Could the initial N be Nathaniel? Do you know his parents names?Robert N's parents were J B and Susan, both born NC.
If you are interested in Cornelia's line, let me know.