What state are you in? Don't know if that would matter or not. But for anyone not on the lease I would expect you don't have to send them anything. If anything, wait for a more definitive response from another forum user more familiar with your situation and state laws on this.
Now I'm in FL where I don't have to deal with state taxes and other things such as a "renters credit". So I'm not all that familiar with said CRP forms. However, when it comes to age, I have had situations where a minor of a lease signatory comes "of age" and remains living at home. When that happens, upon lease renewal after their 18th birthday I require the former-minor-now-adult, to sign the lease too. If anything, it's a step to help them start establishing credit.
He wasn't on any of the checks posting payments until 4/05/23.
I would think if he's not obligated (per the lease) to pay the rent, that would not matter. But maybe it's no problem for you to send the lessee a CRP based on what they paid with checks they signed, and another CRP to the minor-now-adult for the rent they paid with checks they signed.
