Built a trebuchet. Unfortunately don't have the pictures or video of this trebuchet actually working. My friends and I put water balloons in it and then rolled it to the middle school. We had a massive water balloon fight with people who built trebuchets and catapults. This one person built a huge wooden trebuchet with his dad. It flew and hit the school. Seriously the best time in public school I've ever had.
I also built a Rube Goldberg like contraption with my dad for seventh grade science. He did most of the work I just came up with the concept and tested it as it was progressing. Come to think of it from 1st - 7th grade my dad did most of my projects. I was more of a term paper or essay person than a build this, or arts and crafts type of person. Didn't get into painting, charcoal, and pastel drawings until 8th grade.
With my mom, I don't recall her doing any projects especially not school related. She never actually finished high school (though did get her GED) because I think she went off to pursue her dreams of being a ballerina. Now she's in to like interior design or some tit. She did teach me how to garden.