Relativity, as explained to a 12-year-old

Ok, let's say a car is going ten miles an hour,
but you have to say "ten miles an hour
relative to what?" "to the surface of the earth."
but the surface of the earth is moving too
because of the earth's rotation;
you also have to take into account
the earth's movement in its orbit around the sun,
then the entire solar system's movement,
then the galaxy's movement,
then the universe's.

All the kids who packed themselves into the theater
to see Fern Gulley six years ago
are now throwing their butts on the sidewalk,
grinding them out with their boots,
and saying "pass me the bottle, Krystal."

It also works with direction.
"I'm going north."
"North relative to what?"
"To the earth's axis."
What direction is the solar system pointing?
The galaxy? The universe?

On the way home from Concord School,
going down Calrossie road, turning left
onto McGee, the three of us rode
on the back bench of the bus
because we were the last ones off.
Cecelia first, down the road from the egg farm,
then Kristen, who broke her arm in fourth grade,
then me, who never said anything.
Cecelia the drama queen went on to be
Miss T.L. Hanna and plans to
go to Anderson College and study law.
Kristen works at Wendy's.
I'm still here.

With respect to the big bang theory:
the universe is a huge entity
constantly expanding and contracting.
It is conceivable that there are many universes,
all making up something greater, just as
protons, neutrons, and electrons
make up atoms, atoms make up molecules,
molecules make up compounds
and so on,
all the way up to galaxies and universes,
all over again.

We grew up to be angry teenagers
and guitar-slinging cowboys,
riding our blue pickups
like tame ponies,
and cheerleaders with our
boyfriends' numbers
tattooed on our ankles,
and cartoon-watching,
life-wasting slackers.
We're still the same kids.

Reverse: Is it possible
that each pulsating electron of the atoms
we recognize as the smallest possible things
is a universe in and of itself?