All this seems to raise more questions than it answers.After reviewing my notes, it seems likely we have two Ebenezer P. Gleasons loose in Illinois at this time.
I say this because the Gleason that I have focused on appears to have arrived in Illinois as a bachelor in the late 1830s, and then subsequently married one Lydia Strong. They do not seem to have had children.Sometime in the late 1840s or 1850, Gleason died, a victim of an apparently poisoning.Strong was suspected, as was the man she married shortly thereafter, one Dr. Smith.Neither was every prosecuted.
The Ebenezer Philander Gleason that you mention seems to be someone else: he married a Native American woman, yes?This would suggest that we're dealing with someone different.That said, the fact that there are two Ebenezer P. Gleasons running around the area suggests they may be part of the same family.
Do you have any additional information on the Gleason family of which you are a part (the ones you say came from Massachusetts)?