If anyone knows it would be great! Ive been thinking of it for a few hours and I've searched the internet but I've got nothing.

The one main scene I recall is a kid hiding in a lady's closet and he ends up seeing her take her shirt off thus catching a glimpse of the first pair of boobies he's ever seen. A few moments later the boy is talking to an old man laying on a bed I think... and the boy has an odd look on his face and the old man says something along the lines of " Whats wrong, You look like you just saw your first pair of tits!" For some reason I keep wanting to think the movie had something to do with a rocket or trying to make or fly one. I need help. I can't let this go until I figure it out :*(

Just a suggestion; I can't remember all the minor little scenes in this:

"The Astronaut Farmer," from 2006.

The star, Billie Bob Thornton, was trying to build a space ship at home,
And there were three kids and an old man in the movie, as well as
The main character's wife.

Here's a link: The Astronaut Farmer Synopsis