Minimum gap between 2 visits for parents

Hello

My parents were here from May to November 2016. Just want to know when will they be eligible to come back to USA without any issues with Immigration Department at Port of Entry.

Thank you.

Siddharth

There is NO ELIGIBILITY. They were given the VISITOR visa. So, their stay in US must make sense as VISITORS of US but not as VISITORS of India. As long as it make sense for you and your parents can explain that they are visiting US not India, you can convince the officer at the Port of Entry in US. If it doesnt make sense for you, it doesnt make sense for others too.