My parents visited the USA from June 31 to August 24, 2017 (two months). They came back on January 23, 2018. The immigration officer at the port of entry informed them that they could stay in the USA only for a month. He also mentioned that if they extended more than a month, he would make sure that they cannot enter the USA anymore. When I checked the I94, it showed six months. Should they stay here for a month and travel back or can they stay here for six months, per the I94?
Also, the other option is to visit Canada and renew the I94. Or should I contact USCIS to extend the visa? But as the I94 is valid, they might get confused with my request.