The most important this you can do for them is get vaccinated yourself. This reduces both your risk and their risk of getting and spreading COVID-19.
For people who have a condition or are taking medications that weaken their immune system, they should continue to take the same actions recommended for unvaccinated people. This includes getting vaccinated, wearing a mask, and staying six feet away from others in public spaces, unless otherwise advised by their healthcare provider. Some individuals with a condition that severely weakens their immune system may benefit from an additional dose of the vaccine. Please follow up with your healthcare provider for additional information.