Sorry to hear of your loss christian. I only lost my dad to cancer a few years ago, so i can really appriciate how well your doing coming on here and talking about your dad.
The Sam can wait. If you want to have it on the road, have your mum insure it in her name and see if you can afford to put yourself as a named driver.
The harsh reality is, thats life. It ends when it ends and there is very little we can all do about it. But if you can take all your dads lessons on board and apply them to your life, then you will end up being as well grounded as your dad was.
All the best
Nick