Largest funding for a government law enforcement organization and still can't afford a translator? Having a minor family member translate is never acceptable. That's why hospitals and other services hire translators. An org that by definition handles immigrants must expect such a requirement.

And don't come at me with "learn English when you come here". It's not their responsibility that the law gets enforced effectively and lawfully. It's ICE's and they fail horribly at it on a daily basis. They need to see consequences.