fat apple wrote:
"Gluttony is not a secret vice." - Orson Welles
If it doesn't "show," then it's not a problem.
There are so many behaviors, lifestyles, "problems," that aren't immediately visible to the observer. Being fat is not one of those.
*I am not characterizing the poster as gluttonous, but that is how some people think of fat people - as gluttons.
Hit it on the head with that.
Try not to take it as a negative though.
One thing you need to remind yourself is they obviously care about you. If they didn't they would ignore something they percieve to be an issue. They might have a warped sense of an 'issue' but that doesn't stop them from caring.
Frustrating as it is you have a loving family and could do a lot worse.
Maybe you should point out the fact that your sister drinks a little too much and a little too often?