My sister is a US citizen. We want to get permanent residency through her. I am married and I have two kids. (4-6 years of age.) we all have 10years tourists visa and My husband has both flight crew and tourists visas. as far as we searched, we understand that it takes long time to have a permanent residency with F4. We want to learn if we can still make US trips even if we have applied for a permanent residency through family member?