Is it a “RED FLAG” that my fiancee has children and is not bringing them as K2 Children?

Many foreign fiancees, especially from the Philippines have children born out of wedlock and are required to mention all children old and young on the petition, but are in no way obligated from a U.S. Immigration standpoint to bring their child or children to follow using the K2 Visa. A K2 Child would be considered her biological child from age 21 and under.