My wife and my son is in USA on H4 visa. I have changed the employer and my visa has been renewed as well as my wife and my son’s. However my old visa is still valid till Sep 2021, same for dependent. now my wife and son wanted to travel to India and come back in 1 month. can they travel back to US without stamping of renewed visa? Is it ok to travel on old visa stamping and return without stamping?