I don't remember the name of this movie/show/short. Can you help please?

I can't remember the name of this movie I saw when I was little. It looks like it's from the late 90's. It's plot involves these kids like 10-12, a boy and a girl and their brother and sister at the beginning. In the end we find out that the little girl is actually princess annabelle. Her "brother" figured it out because of a heart shaped birthmark I think it was on her neck. But anyway throughout it they're scared to death because the guy who they think is trying to hurt them is actually just someone who's close to annabelle and has been looking for her her whole life so she can be the princess. If this helps i remember the girl is blonde, and there's a scene when she's by herself walking in front of their house and the guy (the guy who's looking for her) is in a black car and recognizes her and lips her name and yells her name and chases after her to the kids backyard is. She's running to her older brother. I also remember their clubhouse in the backyard where they'd try to discuss and such and such. PLEASE HELP, IT'S KILLING ME NOT KNOWING WHAT THE NAME IS. Thank you. :)