Kids book, read prior to 1997 (or so), probably set in the 70s - 80s

[conuly]

(But it could be a little earlier, in the 60s.)

Kid's dad is an astronaut. The kids at elementary school love to play "blastoff" which involves jumping off of things, and the main character's father is, among other things, famous for smuggling a peanut butter sandwich onto the space shuttle because he was tired of astronaut food, even though of course there's the issues of crumbs.