So I need advice ladies. My husband went and picked my FIL and his GF up from the airport and…

So I need advice ladies. My husband went and picked my FIL and his GF up from the airport and brought them home. They just got back from seeing her brother, who is dying from some infection that's spread throughout his entire body. I have NO idea what it is, nor if it's contagious. Should I be worried?? I made him go straight to the shower when he got home and sanitize his phone....I might be over reacting, but I dnt need any of us getting sick and dying! I feel rude texting them and being like, "yeah, so, what is your brother dying from, again?"