How can I completely stop incoming call notifications?

Consider just turning off cellular data? I mean, it's a phone, so it’s designed to let calls come in, but toggling cellular off might give you the break you need.

Head to Settings, then Notifications, and look for Phone. If you turn off Banners, it'll stop alerts from popping up on your Home or Lock Screen, but you'll still see them in the Notification Center. For total silence, use a Focus Mode—create a custom one if needed—and control who can call you through there.

It is a phone, after all! If the calls are too distracting, maybe try watching on another device or just turning the phone off? It's reasonable to seek some peace without interruptions.

Check if your brother is saved as a Favorite in your contacts. If he calls twice in a row, he might be getting through too. Look into your Do Not Disturb settings under 'People'—you can allow calls from Favorites or enable repeated calls there. I keep my phone on Do Not Disturb permanently, and only Favorites can reach me this way.

I had this problem too! In your Focus settings (like Do Not Disturb), ensure both 'People' and 'Apps' are set to 'None allowed'. Set notifications to 'Always silent' and turn off 'Allow Repeated Calls'. Under 'Allowed People Only', make sure you have no one added. This way, no calls will come through at all!