$500 Ford Freestar. Was it a Good Purchase

I bought a 2004 Ford Freestar for $500 that needed some work. My older sister helped out with repair costs and I did a typical tune up on it (Spark Plugs, Spark Plug Wires, Oil Change with a new Oil Filter, new Air Filter). We bought/fixed this for our younger sister who just had her 3rd child and needs a bigger/better vehicle than she has, but can't afford anything after bills are paid. She was very grateful for it and got very emotional when she had found out what we had done for her.