Cashing my Grandfathers check and I'm listed as c/o on the check?

So I am my grandfather’s power of attorney and I got his check from his old apartment today (for his deposit) I went to my bank and asked if they could cash it for him since both our names were on it. Like this: HIS NAME c/o MY NAME. They said they’d rather him be in person with me, but since I am his Power of attorney they went ahead and cashed it for me. Now I’m worried that I did something wrong instead of taking it to his bank, I had simply cashed it as mine. Am I in any fault or trouble? This was not a Government check just a check from his old apartment place. Help me please. Any suggestions? I figured it was OK since the bank let me do it. But then I read c/o only means that I was the address it got sent to? So What is going to happen? The check was for $288 he wants me to save it for him so I figured my bank which is closer would be easier to cash it. Also I handle his Social security checks and I’m his representative payee, as well as POA. I don’t know if this would matter or not, but anyways this is separate from anything to do with social security. Just thought if it had relevance I’d add it in. Thanks