You think on a genealogy website that THEY put in work on, that they would publicly admit that? I will trust a third party researcher on this.They are NOT immediate family.
You can look up this genealogy page and see the Manning family tree
http://gw.geneanet.org/tdowling?lang=en;pz=timothy michael;nz=dowling;ocz=0;p=elisha archibald;n=manning;oc=1