I passed up a trip to Punta Cana with a group of friends this month because I had a new puppy and didn't want to leave her. Friends just got back thursday & are posting pics of the gorgeous beach, swimming with dolphins, kissing seals, & dune buggy rides....now I'm kicking myself in the butt for not going
My pup would have stayed with my parents too, I know she would have been fine while I was gone...I'm the one with the problem.
Your puppy will be fine with your parents and probably enjoy being with the other dogs. The other dogs might reinforce proper potty training even...but if training slips a little, just get right back at it when you return and be diligent about it.
Enjoy your vacation!!! It looks absolutely beautiful there.