Am I the jerk for bursting out laughing at my brother's diabetes diagnosis?

To provide some background, I (17f) have two siblings: an older brother, J (21), and a younger sister (7). For a long time, ever since I hit puberty, my family has constantly criticized my weight. I weigh 140 pounds, which my physician says is perfectly healthy, but my family views it as obese. J is the primary bully; he frequently claims I’m going to have a heart attack or develop diabetes because I supposedly ‘overeat.’ In reality, J consumes far more than I do and spends his time lounging around, yet my parents excuse it by saying he’s a ‘growing boy.’ I’m denied cake or special meals on my own birthdays, while J gets whatever he wants. When I cook dinner, my mother insists I make massive portions just so J can eat his fill.

Despite this, I am the scapegoat whenever food goes missing. Whether it’s a full carton of juice, snacks, or leftovers, I get blamed even if I haven’t touched them. I eventually stopped defending myself because they were committed to their narrative. My daily routine involves being at school from 7 am to 3 pm without eating breakfast or lunch. I only eat dinner when I get home before sleeping at 10 pm and waking up at 5 am. Logically, there is no way I could be the one finishing all the food.

Recently, J told our mom he wasn’t feeling well. He complained of constant fatigue and thirst, so the doctor ordered blood work. It turns out he has Type 2 diabetes. I watched my mom and J stare at the results in total shock, and J looked so stunned that I couldn’t help but laugh out loud. They both looked at me with pure hatred. My mother then forced me to get tested too, convinced that if J had it, I must have it as well. When my results came back completely healthy, I laughed even harder. Now, my mom has told our entire extended family that I’m heartless for mocking my brother’s illness, and I’m being harassed by everyone. Interestingly, now that J has to watch what he eats, food is actually rotting in the fridge because nobody is eating it. Am I the jerk?

EDIT: I’ve seen the mixed reactions. Some say he got what he deserved, while others think I’m wrong because diabetes is life-threatening. It’s only fatal if he refuses to manage his diet. Since I’m the one who cooks, I’m making sure his meals are sugar-conscious to avoid complications. Just because I laughed at the irony doesn’t mean I don’t care about him; he’s still my brother. Regarding my eating habits, I appreciate the concern, but I genuinely struggle to eat more than one meal. The idea of breakfast or lunch makes me feel sick and gives me headaches. Even when I’m starving, I can’t keep much down besides dinner, but I’m going to try to improve this.

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“and since J’s food intake has been restricted everything in the house has been spoiling”

Wait, I thought YOU were the one supposedly eating everything? /s

I would be incredibly petty every time I had to toss out rotten food. I’d say something like, “Wow, it’s so weird that this pasta went bad. I thought I would have devoured it by now? How strange.”

NTA

It sounds like you weren’t laughing at the medical condition itself, but rather the incredible irony of the situation. Seeing karma strike in real-time can be very funny.

NTA - but here is some advice: move out as soon as you graduate and have the means. Get a job if you can, or head off to college. Create a plan and start saving money now. Your family environment is toxic and will eventually damage your mental health. Also, don’t let their bullying cause you to develop an eating disorder. If your doctor says your weight is fine, believe the professional.

If your mother is going to complain to the whole family, you should tell them your side of the story.

Be very direct and factual:

“I didn’t laugh because he’s sick; I laughed at the irony. My mother and brother have spent years calling me fat and accusing me of stealing food I never touched. I’ve dealt with years of insults and being told I’d be the one to get diabetes. THAT is why I laughed. It wasn’t out of joy for his suffering, but because they finally had to face the reality they tried to project onto me.”

If she gets upset, remind her that she started this by involving the relatives. You are simply defending yourself with the truth. NTA, obviously.