2nd time travel in visiting visa- documents ?

[theck_gs]

Hi- My parents already have a visiting visa valid for 10 years (expiring 2015) which they had got when they traveled to US in 2005 to visit my sister. Now they are planning to travel this November to US to visit me. Is there any other visa related document/sponsor document or anything like that which i need to get ready or i can simply go ahead for the ticket booking?

Can you please help?

Thank you so much

[peace999]

Nothing required.

They should keep your contact info and a copy of your visa with them while entering US.
Usually this is not asked for, but just in case an officer wants to know.

[ineedanswers]

If they Have Valid visas than you can directly book their tickets.