Kinder was a patient at defendant’s residential skilled nursing facility. The trial court correctly denied a motion to compel arbitration of Kinder’s personal injury claim because she did not sign the facility’s arbitration agreement. Instead, her adult child signed for her. The facility produced no evidence to show that the signer had actual or ostensible authority to sign for Kinder. The facility could not establish agency by relying solely on the representations of the asserted-agent-adult child.)