Speaking as an objective, disinterested, pair of "extra eyes," here is what I see. Of the people connected in this family, Abraham is the best documented. The other connected siblings have at most one original source, the 1870 US Census. The links to Ancestry trees don't work (at least not for me, today). SJ Mary is the only one with a documented connection to parents William and Mary. "Parents" here is an assumption, since the 1870 Census did not record family relationships.
Otherwise, the only thing connecting these Wilsons is their common presence in Union County, Illinois in 1870. Wilson being such a common surname, this fact falls well short of convincing. The 1870 Census unfortunately did not report parents' birthplaces, which might have added another point of commonality among them (or not).
When stuck in a problem like this, I think it helps to step back and examine your assumptions (for example, that they are all siblings). The profiles contain many statements of fact not supported by the source cited. For example, David's profile states, "Also in the household [in the 1870 Census] is Cassie Willson, age 65, born Tennessee. At first glance, one might think that Cassie is the mother of David, however what we have for his mother is Mary b 1811-1815 in North Carolina." On what authority do we have that? Where is the source? There may have been a David Wilson, son of Mary, but how do we know this record applies to him? Perhaps this man was Cassie's son, and not the David you are looking for. As an aside, FamilySearch has this woman's name transcribed as "Casair," and that is what the handwriting seems to say. It could be a phonetic corruption of Keziah or some other name.
I've never looked at this family before yesterday, so there is certainly a lot about them I don't know. Maybe some of these details exist in the Ancestry trees, but if so they mean very little without original sources. Just based on what I can see at WikiTree, they need a lot of additional research, perhaps starting with a blank sheet and then looking at what is documented and thinking skeptically and critically about what is not.
