H4 travel with less than 6 months validity

Hi,

My Petition/Visa is expiring in Sept 2017. My Spouse and kids already have the H4 stamped (last year - 2015 Dec) .

Their Visa also expires in Sept 2017.

They are however planning their first visit to US in Apr 2017 first week for around 3 months; and by then the Visa validity will be > 5 months but < 6 months.

Can this be an issue during their port of entry visa interview?

PS: Passport validity is > 1 year.

Please guide/suggest.

Regards

Guys, no one has a answer to this? Any suggestions pls!!!