I don't own Rise of the Guardians or any of its characters. And I heard that Jack's sister's name was Emma.

In his Memory

Near the edge of Burgness

Where the forest begins

Lies the head stone

Emma Overland

Carved in

She lays next to the lake

That took her brother,

Where he saved her,

Where he and she played,

Where he lives on.

The lake that took his first life

And give him a new one

There is where a tradition is set

A plainly as the stones itself

A ring of clovers careful woven together

As tightly as the pairs bond

She put the crown of clovers

That were meant for his head

On the water's edge

Tears would fall

Only to be played off as joy

She knew Jack well

He'd make them joyous ones

One way or another

He always would

Though as the years pasted

Her days numbered

She spoke to her brother

Whispers spoken into the green leaves

"Dear brother, may you spread your smile far and wide. May you feel my love. But most of all, may the fun we had live on."