Family not taking symptoms seriously

My brother was off school on Friday as he hadn’t been feeling very well. He had a sore throat and runny nose - which I know aren’t symptoms of Covid but my dad is vulnerable so naturally I was a little worried. My cousin recently tested positive and his only symptom was a sore throat, not to mention, many people at my brother’s school have tested positive. My brother started having coughing fits in his room later that night which eased off the next day. I told him to wear a mask and stay away from my dad but he didn’t listen, and my dad didn’t care. My sister is now poorly (no Covid symptoms as of yet) and she also won’t wear a mask/distance herself from my dad. I share a room with her and am very worried about contracting the virus (if she has it) so I’ve been wearing a mask. I am so upset and annoyed at how everyone has completely dismissed how I feel. I’ve spent the last 6 months consumed with anxiety about giving my dad the virus yet not even my dad himself gives a ****. Am I right to be annoyed?
















I suggested

No offence. Your family live dangerously.

Tell him that they may do as they please but you do not want them putting you at risk so to please keep their distance.
It does seem a bit of a stretch to social distant with members of your own household, though. It'd be very hard if not impossible.

At the end of the day, your dad is an adult and if he choses not to distance from your siblings when they are unwell, that is his choice and all you can do is accept it. Obviously, coronavirus can have many symptoms and you can't tell whether someone has it based on symptoms alone, however there are lots of cold going around right now as well and hopefully that is what your siblings have. If it makes you feel safer, wear a mask, wash your hands and try to keep social distancing if you can.

Update?
This happened in my family, now my dad who is extremely high risk has the virus

My brother didn't have the virus luckily so we're all fine. I'm so sorry to hear that, I pray for his recovery.