My mom is in the hospital and doesn't want her siblings to know - should I tell them anyways?

My mom has been admitted to the hospital twice in one week. Although we don't have test results back for all of her conditions, it seems pretty serious. She could have died earlier today. She is still in critical care but stabilized. She'll be here for probably at least two more days.

Only my dad, brother, and I visited today. She has several siblings and, as far as I know, has not talked to them in several years. Except in regards to one sibling, she has never told me why. She has a tendency to hold grudges against people. I asked her today if I should tell anyone else that she is in the hospital and she said no.

My brother thinks we should tell her siblings because they might be mad/hurt that we didn't tell them especially if she gets more ill or even worse. We can just tell them not to visit. I am worried that they will try to contact her (she has her phone with her) and she will get mad or stressed out.

What's the right thing to do? Thanks.