The tenant moves in, and three months later wants to break the lease because his wife didn't sign it. Do all adults living in the home sign the lease? What about an adult student? The simple task of lease signing is often done wrong, according to Florida property management attorney Harry Heist. Improper lease signing can cause a myriad of issues, and you need to know what specific measures to take to ensure you don't have problems later on. As always, make sure to check with your own legal counsel for the law in your state or locality.