Having lost my dad a couple of years ago, my thoughts and prayers are with you and your whole family. I won't presume to know how you feel, as we all deal differently with things of this nature.
But I do think as human beings, we would all like to think that we have or had made a difference in others' lives. Surely your Dad is smiling down knowing that things he did mattered. Cheers to you for recognizing that, and I'm sure some of him will continue to pass down from you through the family tree.
A beautifully written snapshot of life. Thank you for sharing with all of us.