It's insanely ironic that the gold standard for US ID is the passport, but a "RealID" driver's license makes you jump through a lot more hoops than getting a passport. The PITA of the DIY photo standards notwithstanding, the passport is MUCH easier to get.
In most states it's especially difficult to get RealID for minors, because they just don't get much "official" mail. I used DD's passport, birth certificate, original SS card, and a copy of her school transcript (but for the transcript to be valid for this purpose it needed to have her street address on it, which it didn't because her school has digitized all communications. I had to petition the school's IT Dept. to populate the transcripts with home addresses, then wait while they made the software changes.)