Subject: Could Earth have been part of another solar system?

My fifth grade students are learning about the sun and other stars.  Upon
realizing that the sun is much smaller than some other stars, they were full of
questions about stars and solar systems.

One question, in particular was interesting:

Since the sun is going through its life cycle, when it dies, will the Earth and
other planets be attracted to the gravity of another star and become part of
another solar system?  And then, taking that idea further, is it possible that
Earth was once part of some other solar system before our sun?

Re: Could Earth have been part of another solar system?