The better educated ones are. Sometimes, it leads to educational homiletics prior to the introit of the mass…
I’ve had priests ask if my then 5 year old was to commune. She’s never been refused by a priest. (She was by a bishop. But she didn’t complain; it was at a state funeral presided over by two archbishops… )
Mind you, I have seen some refused, but it wasn’t my child. Then again, ushers tend to warn the priest “there’s an Orthodox guy in the front pew,” so I tend to meet the celebrant before mass and explain.
I’m told one of the villages has a tube for communing Orthodox children; the neighboring village is Orthodox, and they share the same hunt-path and fish-camp.
I once received an email from a RC priest of my acquaintance asking where to find the rules for communing the Orthodox, sent when he got to his new parish and realized the town is mostly Orthodox… (He’s no canonista. And the archdioceses’ JCD was unavailable.) I sent him links to the online CIC chapters relevant, and to the online USCCB rubrics. He was relieved to find the rule about the spoon in the rubrics for the Missal.