The IRS days ago just sent out a new stimulus check to more than 2.3 million recipients, and while everyone is also waiting for the first of what will be a new monthly series of stimulus checks starting July 15 — thanks to an expansion of the federal child tax credit — there’s another stimulus benefit accessible to families that’s actually more lucrative than all of that. And it’s hiding in plain sight, as it were, with many families likely not even aware of its existence.