My Family Member's Boss Is Refusing To Relieve Them At Their Post. (federal Security)

My family member is an armed guard at a very well known aerospace company that has been running rampant in online meme forums for "whistleblowing."

They started work Sunday night at 10pm. It is currently Tuesday 8:20am in V.A and they are still stuck at work. We got about a foot and a half of snow over here. Their boss just keeps saying "people keep calling out so you'll be there longer," but is refusing to come to the site and just relieve them of their post himself. They get no breaks and currently is still on post doing patrols with no end in sight. They take blood pressure medication and recently had surgery for a cancerous tumor and since they can't get home they haven't had any access to their medication.

I'm more so worried about them collapsing on the site while ARMED.