I need to encourage my family to lose weight (10 points)?

-ok so im a 13 year old girl and im 4'10 and weigh 90 pounds so i am normal weight, but everyone else in my family is obese. my dad is 5'8 and 365 pounds my mom is 5'2 and 256 pounds, my 10 year old little brother, who is bigger than me, is 4'10 and is 205 pounds, my 17 year old brother is 5'10 and is over 475 pounds (idk his exact weight cause our scale has a max weight of 475 pounds and when he goes on it, it just reads "WLE", and i read the instructions on the scale and "WLE" stands for "weight limit exceeded" so for all i know he could be 500 pounds) i also have a 2 year old baby sister. i am really worried about my family and were their health is headed. every one in my family eats alot and just sits on the couch. for dinner all my mom makes is unhealthy foods and makes alot of it. i am a very picky eater so i dont eat alot, but the rest of my family is different they can eat everything in site what i eat in a week they eat in 1 meal. especially my older brother. he has a job at mcdonalds and employees get free lunch so he eats maybe 4-5 big macs every day. and also i dont even think my little brother knows that being obese is bad like sometimes i see him playing and squeezing his belly fat one time he said "look at my belly it jiggles like jello" and started laughing. i think because he sees how the rest of our family is obese its normal that he is. i try my best to encourage some exercise but it seems like they dont take me seriously. like a couple days ago i was going to take a jog around the neighborhood and when i asked if anyone wanted to join they looked at me and laughed and said "no thanks" then i asked how about a small walk the only one who went with me is my younger brother, but only 10 minutes into the walk he was complaining about how he was tired and his how his legs were hurting and he was breathing very heavily. i love my family with all my heart but it really bothers me with what they are doing. iv tried to get other people to tell my family that they should start exercising but it hasnt worked. i'v told my older brothers long time girlfriend (who is obese her self) to convince him to lose weight but she tried and still nothing. i and fear the most that my baby sister will end up obese.

when ever i have had a problem my family has always been there to help me now they have a problem and for once i want to help them

i really dont know what to do please help.First of all, good for you for A) caring about your family so much and B) keeping yourself healthy. If your suggestions to exercise or eat healthier aren't working, sit your family down and tell them that you care about them because of the health problems being overweight can lead to. Tell them you love them and want them to be around for a long time. Avoid using the word 'fat' and talking about appearance in any way. If they know you honestly care (which you do) about them being HEALTHY rather than losing weight just to be thin/attractive, they will listen to you. If they don't, try talking to your family doctor. Best of luck xxxHow did you manage to keep your weight down and not your brother? Well, what you can do is try to have family time outside by playing games, tug of war, tag, baseball, catch football etc. Try to talk to your family members one at a time by bringing them outside for a quick walk around house or block. Not sure of our surroundings but try to introduce fruits and vegetables as well as exercise. Start them off with a few minutes of walking first. We want to make surw your family lives a long and healthy life. Look for things to do together also have them watch Dr. Oz if you have that being broadcast in your area. I wish you best of luck and I hope in a few months your family will be healthier. Ask about how your parents grew up and what type of lifestyles they may have been introduced to, that may have an affect. Good luck.