A.H.
Cindy-
I think that what you are doing so far is on the right track. My next suggestion would be to remind Louis that he is NOT the parent and that he is NOT to be doing the parenting. Whenever you catch him making rude comments to Wesley or trying to tell Wesley what to or not to do, I would correct him and punish him in the correct manner. Although it is a different circumstance, my step-kids thought that they could boss my kids around because they were so much older than them. I corrected them and told them that they only needed 2 parents, not 4. It took a little bit of the 'punishments' for them to understand that they weren't in control because of their age (or in your circumstance Louis' intelligence) but they eventually understood. Good luck!