Just get an online account with username and password for each or get the statements mailed to your house.
My mom has alzheimers and my dad takes care of all the finances. I’m on power of attorney and my name is on the bank account. I have all the account numbers, names, and passwords in case something happens to him.
If something happened to my Dad, I’d pay off his credit card and get a debit card to pay for any incidentals my mom would need. Since she doesn’t need a credit card in the nursing home, it wouldn’t matter.
Taking care of their finances while they are both alive doesn’t mean you have to have your name on it. Just think of this as a bookkeeping job. You pay their bills, open the mail and keep things organized.
You are a very good daughter!