Forum:Harpie Lady Sisters... Triple Pet Dragon Power Up or No?

Hey, I've been curious of this for awhile... in the anime, Mai's Harpie Pet Dragon got a triple power up from the Harpie Lady Sisters. Does that apply in the card game, cause the card description for the dragon says only for Harpie Lady... but it seems unfair that the sisters don't give it a power up. Kinda sounds like I gave myself my own answer. BUT I haven't seen an official rule saying it doesn't. Well if anyone has an official ruling saying yes or no I'd appreciate it.