It's too late to help your son, but I will post a reply in case anyone else is interested.聽 Folks from the US can/should get a 10-year visa.聽 That does NOT mean you can stay ten years. It's a prerequisite to temporary residency.聽 However, if you have it, you can temporarily exit Paraguay by bus, visit Argentina, and re-enter.聽 After I did that for about 14 months, I started getting pushback at the border but was able to get in anyway.聽 Shortly after, my residency application was accepted, so I have had to leave since.