It seems what’s good for Ali Lohan is not necessarily good for big sis Lindsay–at least when it comes to the E! network reality-TV show Living Lohan, according to mom Dina Lohan.

“I told Lindsay I don’t want her on the show right now,” Lohan tells TV Guide. “Doing reality TV would almost be taking a step backward as far as her career.”

But for Lindsay’s 14-year-old sister, Ali, the show’s a step up from relative obscurity ( la MTV’s The Ashlee Simpson Show, which plucked another then-unknown sibling out of the shadow of her famous sister).

The eight-episode series, which premieres on Memorial Day, will document Dina and Ali’s temporary move from the family’s home in Merrick, New York, to Las Vegas, where little sis will record her new album.

“I just want to get the message across that we are a normal family,” says Dina, who insists she’s not a “crazy party mom” and she’s “never partied with Lindsay.”

In fact, Dina says she’s doing this reality show to clear the air: “I did this to defuse the rumors about my family. The media has just been so horrific to us over the past two years.” –Janet MurphyKevin Mazur/WireImage