If Reuben Allison married Louisiana King in Greene, GA, it looks like that couple moved to Alabama because the US Census for 1870 shows Reuben 62y and Louisanna 52y in Alabama with son, William 30y.
The 1870 Census shows Alfred Allison 32y, born GA and wife Martha 30y, both living in AL. They have a daughter, Lavina 9y, and three sons, Paul 4y, Gilmer, 2y and Charles 8 months.
The 1880 US Census for Auburn, Lee, Alabama shows Alfred A. Alliison 42y, wife and children are the same as in 1870 with two additions, Felix 5y and Edgar G. 2. Alfred's occupation is farmer.
Does this look like the Alfred who is Reuben's son? Do you think that Reuben Allison's parents might be buried in a Greene County Cemetery?