Hello everyone, this is a silly situation, nevertheless I thought it would be worth to see what everyone thinks about this. In about a month I have to turn in a photography exam for uni, and I need to work on a project that consists of taking 10 pictures tied together by a theme of my liking, but that's not the relevant part, it's just the context. As the subjects for my pictures I chose two of my brothers (one of which is my fraternal twin brother) and my sister. The day before I took the pictures, i asked them if they would be willing to participate, they all agreed, my twin brother was sick but he said he felt better and that he would be able to do it, and that was that. The following morning I gathered with my brother and my sister, my twin brother was taking a while to come so I went and called him, he was sleeping "which I did not consider off because it's summer and it's usual for him to wake up late in this season", I woke him up and took him to the others, I took the first few pictures and then he started complaining that he felt sick, at that point I told him he didn't need to continue if he felt sick and that I could easily find a replacement "my sister's BF was also there, so we could've used him as a replacement", or that we could simply keep going tomorrow when he felt better, I explicitly told him that I would rather him not to participate if he was sick and if he was only doing it because he felt bad for me, he CHOSE to stay as a subject and kept going, so I took all the remaining pictures. After all was done a couple of hours later he pretty much berated me, my brother and my sister, he said we "lacked empathy" because i asked him to do this, he was sick and we should've noticed that and let him be, after which, I was flabbergasted and reminded him that I had offered him to stop if he still felt sick and that I didn't want him to do it if he was going to only because he felt bad for me, but he kept shouting at us very angrily and told me that it's my fault for my "inability to notice that he was visibly sick", when from my pov he only looked tired "which is a usual thing", not necessarily sick, and also, when I asked him the day before if he wanted to participate, he did agree and told me he felt better, so I just assumed he was good. AITA?