Oh, I'm sorry!! That's awful!! D: Is it possible you can get together for a barbeque in a couple weeks?? So that way you can see your cousins, and it will still be a bit of a party!! :D
Praying for your mum and your family <3 And ofc your cousin on graduating!! Woot woot!! That lucky ducky!!
(Only gotta get through three years of high school till I'm out, yesssssssssss...)