I have to babysit a 8 year old boy a 6 year old girl and a 10 year old i need games to play with them?

ok i am used to babysiting the 8 and 6 year old but not the 10 year old (who is the same age as my little brother) she according to my brother is not to fond of me which i am assuming stems from the fact that she doesn't get to watch her younger sibling but i do. also i know she gives me the cold shoulder a lot(we are neighbors so i see her a lot) and now i am babysitting her and not just her younger sibling. i am afraid she will take that as the ultimate insult. also i am babysitting from 8am-5pm for maybe 4 days so i don't just want them to watch TV or play on the computer so i need fun games that they all can participate in and won't be bored with. especially the 8 year old boy (he is going in to 2nd grade) and make sure it will appeal to a 5 year old and a 10 year old. i also need to make them lunch i need creative suggestions that maybe the kids can help out with but at the same time won't make a huge mess are possible slightly nutritious but won't make a mess. it also need to be somwhat easy because my culinary skills have not evolved much past mac and cheese and kasadeas (sorry don't know how to spell that if you don't know what it says it is tortillas with cheese inside cooked and melted : ) ) thanks so much