How to achieve immortality

Several years ago, I received a package from my sister that included the following:

I waited an appropriate period and sent it back to her.

We visited Vermont, and it was in my suitcase when I returned.

I visited NC and put it in her car.

She snuck it into a box from Mom.

I put it inside a handbag that I sent her.

She wrapped it up with my Christmas present.

Neither of us will stop until one of us wins.

We will live FOREVER.