The show was in the 90's. If I remember correctly, the alien/babysitter is either an imposter posing as an aunt/mother of one of the main characters. The main characters are children, who discover the person is an alien, because she pricks her finger on a rose and it bleeds a different color. (I THINK) They also discover that water harms the alien and use that do destroy her. (In a pool, if i remember correctly) ANY IDEAS, GUYS??
Just stabbing in the dark but could it have been an episode of CBS Story Break?
Check an epi list for it.
Check an epi list for it.