Ahh, that hurts even to read about. My 4th wife had that happen to her. Her mother died and her siblings "forgot" to tell her until after the funeral.
You have been edited out of their family narrative. You are being tolerated but they don't consider you family anymore. Not really.
If they did, they wouldn't do this to you.
The silver lining in this heartbreaking account is that it sets you free. Now you know how they feel about you. Actions speak louder than words and you can see the reality behind their polite lies.
Now you can create your "family of choice" without guilt or reservations.