Help with famiky sharing and credit card getting expired message

I have family sharing with my son. Recently he let me know that our shared payment was showing expired. I updated the card on my end but it didn’t update for him and it’s still showing the old card information. I’ve tried adding other payment methods, loging in and out of iCloud on both our phones and I’ve logged in to icloud and can see a “family credit card” with 4 last numbers if the card but I no longer have that card or information and it will not allow me to click on it to see it or remove it. Currently my son cannot make any purchases and I need to get this resolved.