B visa Validity

GURUS

My sister and brother in law wants to come to usa. I have 2 nephews also aged 10 and 13. Whats the safe way ?????
Either all of them apply together or 1st my sis n bro in law apply and afterwards my sis apply for my nephews????
I will really appreciate some guidance here.
 
I would recommend to visit the website of the U.S. Embassy at Stockholm. It has an excellent guide what is needed for a visa application and helps to avoid visa denials based on missing documents. The London U.S. Embassy is well known for its high visa denial rate, more than 25% B-visa applications of British citizens who wanted to stay for longer than 90 days got denied in FY 2008.
 
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