I' m really sorry about your brother. And I believe what you say is very true and wise. My mother keeps telling me not to say anything to my grandmother, for example, so that I save her this worry, and to be in girl mode when I go visit her.
She also asks that I wait before hrt that all of them (family members) are not in my life anymore, so that they won't have to be bothered by this.
But you are right. We should talk, and be honest to the people we love beacause one day we might not have this opportunity anymore and regret it.
Your story was very touching. Hugs, and sorry for your loss.