I am applying for US citizenship. Me and my wife are both on GC. We have 2 kids. The elder one is with us but the younger one is currently with his grand parents and not in this country. This is only temporary and he will be back here in 2 months. Here is my question: should I indicate both my sons are living with us as our younger one is only there temporaririly like an extended vacation? If my interview/oath is scheduled before he gets back would that be any problem? Do they ask for any details or check kids passports?