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I did come across that other sons birth record yesterday for Abner and Lucinda but haven't been able to track anything about him other than the birth itself. He's not listed on the next census they are on so figure he probably died that or living with other family. I might try and see if the location address might turn something up. With the younger Abner being in Dunklin I figure that's him since by 1886 he married Lucinda in Dunklin I do have a marriage record for them.
Does make me question if there is some connection with that name to the Bennett family I have yet to look into. Maybe relatives from the mothers side or maybe the fathers if he was born out of wedlock. I'll have to give that a try and see what turns up. Hopefully I can figure this out. So far no luck looking through the probate records but there are quite a few so fingers crossed I come across something about Abner there.

There was one record I came across that listed his birth place as Illinois so I'll give that a try too. I was unware that it was so common for the birth places to me listed incorrectly. There have been 3 locations I've seen on records so hopefully will be one of them  . I just started looking into the military records and possible son being named after a father. I'll check to see if any of the girls are named after the mother as well.
I had come across the newspaper article about his death but wasn't sure what paper it was from. I've been a bit stuck trying to locate the death certificate. I came across one site for deaths from Arkansas but it started in 1914 unfortunately  .
Thank you all so much for the ideas on how to hopefully solve this mystery.

Thank you I'll definitely try to see if I can find that. So far I've been unable to track down a death certificate for him other then what I believe is a newspaper article about his death. I've tried searching on ancestry with no luck. Any site suggestions for deaths in Arkansas circa 1903?

I have checked for her death in the past. William and Margaret did lose their one daughter Ethel at the age of 1 but I have no idea what happened with Mary. I looked into the marriage with Thomas and found a 1911 census which I feel proves this is infact my great grandaunt. She had a son named William Walton Blenkinsop. Thank you both so much for the help this has definitely finally answered a lot of questions for me 

The death for Elizabeth Lee definitely would fit and the location it states for birth is close by in comparison to the Elizabeth Pearson. I will definitely have to get my hands on the marriage record to verify her fathers name. I know that Elizabeth couldn't read of write so maybe it was possible she wasn't exactly sure of her birth year. Thank you both for all the help you've given me it's definitely made this mystery less confusing