Always sick... and probably faking it

I have a sibling who claims to always be sick. Flu, cold, pulled muscles, migrianes, fainting, you name it they currently have it. It's to the point where I'm concerned there's something wrong mentally because my sibling seems to like the attention it brings. They are always going to the ER, Snap chatting the pain they're in (doctors never find anything but will write prescriptions for drugs *red flag to me*). It's a daily thing.

I'm so worried because this person is now pulling their 5 year old daughter out of school frequently claiming they're sick and putting it on social media.

My family is concerned but none of us know what to do.