I can understand your kid maybe being scared of the Marley brothers, despite them being rather humorous, but how is the ghost of Christmas Past scary? She's the sweetest and gentlest of them all... it's because she looks like a china doll, isn't it? Yeah, that's not judgmental at all.
Anyway, this still remains one of my favorite adaptations of the book. It's very well done and the songs are great. I only have a few gripes. The first one is... I didn't find this quite as funny as I used to. I used to think this movie was hilarious. Now it gets a light chuckle every now and then but that's about it. I'm also mixed about this version of Scrooge. In some bits, he comes across as more heartless than he's supposed to and in other moments, he comes across as more generous than he should. Still, I highly recommend this version.