Landlord Michigan Laws.?

my son was in the bathtub and everything was fine, except the water went over the overflow thing? and its suppose to go through the pipes if it does go over the overflow...but our landlord informed us today that we are responsible for the charges in the downstairs bathroom, because it messed her drywall up. don't think its my fault at all to be responsible for that...at all. can they charge us for that?