Frequently asked questions Can I get an MMJ Card for my child in California? In California, you can get a Medical Marijuana Card for a minor with parental/guardian consent. Medical marijuana has been proven to be effective for many conditions suffered by children. Leafwell providers understand this and frequently work with parents/guardians to help them get their children the medical care they need. Cannabis could be a far safer, less addictive alternative to opioids and sedatives, which are also sometimes prescribed for children with serious conditions (e.g. cancer, epilepsy).