In all seriousness, if the $20-25K makes a big difference in your life today, and priorities prevail, of course the decision is easy.
But if the money is secondary, you clearly cannot sell this family memory. You'll never replace those, and the car, even if replaced sometime later, will never match up. With the market where it is, I personally think you're nuts to sell at all.
Only you can set the level of importance in your life, and I wish you the best.
Nick