Does anybody remember this old karate movie?

[forrestparkay]

Ok, so this has been bugging me for a couple of months now. I saw this movie when I was a little kid, so I'm a bit hazy on some of the details, but I think this is how it went. There were these three kdis (siblings). I think there was an older sister, a borther, and a younger brother. The younger brother was fat and really liked to eat. The middle brother had a video game that he liked to play. The older sister was probably the rational, responsible one. The kid with the video game discovered that his video game told the future. He was fighting some ninjas in the game, and once he finished suddenly those ninjas came to fight him and his brother and sister. And then the rest of the movie was just them figuring out how to keep these ninjas at bay.

It probably came out in the late '80s or early '90s.

So that's about all I remember about it. I could be wrong about the girl. Maybe they were three boys. I could also be wrong about the fat kid (it seems to be a common theme in these types of movies). But I definitely remember the video game. Does anybody remember anything like that?