I have family from germany who came to visit us on march 21, 2012. 4 people, 3 of them, Jack, George, and Harry have german nationality and are here on the visa waiver program (first time in US) the 4th one. Mary, is married to Harry is here on a B2 visa, which is valid for 6 months starting march 21st 2012.
The question is, we all would like to take a trip to Tijuana, mexico for 2 days. Will any of them have a problem when they try to enter back in the states after visiting Mexico?
If it's a hassle I would not take them them there, if its possible they would very much Love to go.