email to him, you want all your tenants happy, but it appears th

 But it appears that you can't do it for them, then you may have to let them go if he wants.  The house's condition hasn't changed since he first looked the house, it rents as it is ( this should be in the contract).   you can't do anything about it,  后院草地除虫 is the part of maintenence, it is the tenant's responsibility.