Its fashionable to attack the mothet here but i dont think thats the way forward..
This man is to blame for allowing her mum to run his home.
Face the wife and state the facts ad they are and stop such populist tendencies as thinking she will overeact.
If the wife doesnt change, escalate to wazees, be it church elderrs or whoever u escalate to
if she doesnt change, officially take her back to her parents .
By this time, both the mum and wie have reevaluated selves
tell ua friend and self too to know when to be a lion and when to be a lamb
For in him (Jesus) we live and move and have our being-Acts 17:28