Splitting the child dependents?

My daughter and her two kids live with me. I provide 90% of the household expenses. Per the rules, both my daughter and I qualify to claim the kids as dependents. (I used to be able to claim her as disabled adult child dependent, but now she works PT and made over $5,050 in 2024).

If I claim them (or one of them) as dependents, I get to file as Head of Household.

If she claims them (or one of them) as dependents, she gets the Earned Income Credit.

Best scenario is if I claim one, and she claims the other child. Is it legal? All the instructions I find always talk about "the child" as if no one ever has more than one. Or is it because it's totally okay to look at each child individually?