And again?

I just (5 minutes ago) found out that a mom from my older son's preschool days died suddenly about a year ago.

I am going to, today, write a letter to each of my children telling them how much I love them. Then this weekend I'm going to think about all of the subconscious hopes I have for each of them, and write them each a letter about that. I'll send copies to my brother and sister.

What else should I do?  (Besides life insurance and will stuff?) If your parent died too young, what do you wish you had from them? What do you wish they'd done?