From what I have seen there's alot of things to help with this.
I'll make a short list.
1.Make a book full of photo's of the new home and family
so the kids can get use to seeing them so they know what to expect.
2. try and talk on the phone offten with them so they can get use to hearing your voice.
3.Give them items before the adoption so they for sure have somthing they can take with them. So they have somthing there use to.
4.Visit as much as you possibly can.
5.Over all just take it slow and remember
it may take time for the attachment to the new parents to begin.
Also for more idea's I recomend the book
"Toddler adoption the weaver craft"
It's full of all kind of stuff. awsome book truly.
Good luck
