Those kids have an advantage over all of us ~ they grew up in households where people spoke Spanish and talked about Mexico and it's quaint folkways!
SEND THEM BACK HOME!
Wow, a whole day. Imagine if you had gone there by yourself, knew nobody, didn’t speak Spanish very well, and had to live there for a year or more, without help, or a whole lot of money.
You don’t even have, nor can probably afford, a room for the night. You would be desperate to get back to the US in any way you could, because you would otherwise be dead or a slave within a month.
You can’t “send them home” when here is their home. The only home they’ve ever known. Me, I’m not into brutalizing children. I’m willing to look at some alternative to doing that.