my 80 years old father (who has health problems) accompanied by my brother who both are Japanese citizen and came to the US with VWP. And my dad had really hard time coming here can not fly anymore so he decided to stay with me here in the US (I am a US citizen). I filed I-130 for my father and thinking about file I-130 for my brother so he and I both can take care of my dad. However, my brother has a trading business in his country and need to go back and forth between the countries (Japan, China, the US). How will applying I-130 for him (F4-1 visa) affect his travel arrangement?