Not grandfather, step father. His mom is patty duke, one of the most prolific sluts in Hollywood. They didn't even know who his dad was. Most people thought it was Lucille Ball's kid so he would be I love Lucy's grandson. But it ended up being some other dude she was with. But Gomez adopted him.
So many of them are, and it even extends to directing or back end roles with films. I think Francis Ford Coppola's got two or three kids that are making movies. Cronenbergs kid is doing it, but he actually makes decent films.
Look at Emilio Estevez and Charlie Sheen. It's rampant in Hollywood, but I guess if I was a famous director or a movie star I would do everything I can to give my kid a leg up. Can't necessarily blame them, it's no different than starting a regular business and hiring your kid that shows interest or aptitude for whatever profession you do.
So they have coordinates to the other hidden planets. Why not just go to another one of them to get the coordinates to At-Attin? This show has a paper thin story and they're milking it for all its worth.