Paid a bill late- affect my co-signer?

Hi everyone I am freaking out a little

I paid my student loan bill 4 days late. My dad is my co-signer so I’m worried this is going to affect his credit.

A little background incase this is relevant- my loan is 8 years old and I’ve never missed a payment or paid late. I’m really on top of it, but I just completely forgot until my husband brought it up to me 🙈🙈🙈🙈. I’m hoping since this is literally the first late payment it won’t be too bad. I am worried about my credit but more so worried about my dads. Google gave me mixed responses. Does anyone know?