I am looking for the title of a song. The song is about a child that is being sent overseas to meet up with his/her parents after having been separated for some time. The child wonders if the parents will recognize them. I have some of the lyrics...can anyone help?

It's been so long since they've seen me
I wonder if they'll know me now

We gave them our four pound and twenty
One last look at the great rocky shores
They said that the new world had plenty
And we never see ??? anymore

Will they know their lost little children
When they look for my face in the crowd
It's been so long since they've seen me
I wonder if they'll know me now

Now hold to my hand little brother
Be brave and please try not to cry
We have a good father and mother
And soon we'll be safe by their side

Will they know their lost little children
When they look for my face in the crowd
It's been so long since they've seen me
I wonder if they'll know me now

Will they know their lost little children
Will they look for my face in the crowd
It's been so long since they've seen me
I wonder if they'll know me now

I wonder if they'll know me now.