Lenders who do VA loans typically require a 640 credit score. If I am not mistaken, his credit score will be used not yours. But I may be mistaken as I haven't brokered a loan in a while. If you would like free help to boost his credit please visit my blog here on Trulia, or go to our website.
Best of Luck & Have a great day;
CEO & SR Credit & Mortgage Consultant of
Everlasting Credit Repair
Making home ownership more than a dream...
Retired Mortgage Banker