Hi, For info in USA on Ancestry.com just click on all the web. You can buy 20 credits for £6.99. these last a week and can be very helpful. However no records are available for people leaving the US. It is a difficult avenue to research. If you have any idea on when they left you should try LDS , go onto familysearch.org. look up the dates for passports. You can order a tape which can be viewed at the church, this will cost less than £3 , you have a month to view . Good luck