How can we help migrants right now?

I’m not sure where else to ask this- I know a migrant who I’m afraid might get picked up. They’re a really great person and amazing parent with a child they have half of the time.

What information can should I get from them in case they get picked up? People to notify here and back home? Anything else?

It feels insane that I even have to think about asking this.

Edit to add: just in case anyone gets curious, I am in no way talking about hiding people or harboring anyone.