As an adult kinship caregiver, you can sign a declaration saying you are a relative responsible for the health care of a minor child. Washington Child (Minor) Medical Consent Form.Use our Child Medical Consent form to let someone make medical decisions for your child in your absence. If you are under age 18, you can get healthcare services without an authorized adult's consent if you are married to an adult. With limited exception, Washington State law requires parents or legal guardians to provide informed consent for health care for their minor child. You can consent to any health care to diagnose, treat, or keep up the child's physical or mental condition. This includes dental care. This form provides legal permission to treat a minor with a designated adult who may be present during treatment (Child under age of 18). If the patient is a minor, between the ages of 13-17 years old, or who meets any of the criteria below, they will need to add their signature to this form.