I have an 11 year old half sister (we have different fathers) who is overweight. I am 23, so there is quite an age difference between us and that has led to us having completely different upbringings. My mother was turning 20 when she had me, she was young and single and life was great for us, she hated to be in so we'd be out exploring every weekend and I did gymnastics and trampolining to competetive level from a young age. This led to me becoming a very active/ health conscious adult, I studied dance and am now studying martial arts - diet and exercise will always be important to me.
Sisters childhood: mum had no energy due to back problems, mum in relationship while raising sister so less if any of the activities me and mum did together. sister's dad likes to game so whenever she got bored and asked for cake/ ice cream/ sandwich he'd say yes so she wouldn't nag. Somehow I feel guilty about not stopping this earlier but I was in secondary school and obviously was completely oblivious. I should note that my mum and stepdad are also quite overweight and they think I'm the one with the problem when I get annoyed and try to change sister's eating habits. Also, we had to move her to another school because of BULLYING about her weight when she was in PRIMARY school. I got her to join martial arts with me to get her more active and we've been gong for a year now but I still hold some anger for this bad start I feel she's been given. Am I right or should I leave them alone?