Hi dawngiffordengle,
To see what numbers are blocked on your iPhone, check out Block phone numbers, contacts, and emails on your iPhone or iPad:
- For FaceTime - "Go to Settings > FaceTime. Under Calls, tap Blocked Contacts."
- For Messages - "Go to Settings > Messages. Under SMS/MMS, tap Blocked Contacts."
The resource also provides information on checking for blocked contacts in Mail and for phone calls.
If you are able to call your mom, but they are not able to see a notification on their end, have them check their blocked contacts as well.
Take care.