What's a good way to tell someone to stop bringing their sick kids around?

My mom in law and sister in law keep bringing their sick kids around without telling me when we get together. It's very frustrating because I'm immunocompromised and pregnant. Honestly just furious that they continue to do this. My husband has hinted nicely to them, but they don't seem to get it. What's a direct way, but 10 times less angry way than I actually feel, that I can tell them their behavior is extremely rude? I'm so tired of getting sick from them. Especially now that I'm pregnant

What's a good way to tell someone to stop bringing their sick kids around?
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