There have been many reports over the years of people claiming what you are saying here, and many have come "unstuck". From a a guy just sat in his wifes bar, to guy helping his wife sell chicken from a roadside stall. Immigration if they are of a mnd, will do what they are going to do! Technically you should not be there.
Realistically, throw the dice ! I definitely wouldnt be checking people in. It onbly takes one phone call. one video and your sunk !
Dont risk it is my advice. Keep a very low profile.