Hyper Sapien: People from Another Star

Robyn is a teenage girl whose people from the planet Taros have been hiding on the Moon, biding their time to assimilate with Earthlings. She grows impatient. Robyn, Tavy (a younger girl) and Kirbi (a furry tripod creature) stowaway on a mission to Earth and sneak away. They are befriended by a Wyoming rancher's son. He hides them at his open-minded grandfather's house while his parents host a senatorial campaign barbecue.