
Mia Farrow's younger sister, Tisa Farrow -- who acted in movies in the '70s -- has died.
Her older sibling just announced her death Friday ... with Mia saying on Instagram that Tisa passed unexpectedly just a couple days prior on Wednesday, "apparently in her sleep." She adds, "If there is a Heaven, undoubtedly my beautiful sister Tisa is being welcomed there. She was the best of us - i have never met a more generous and loving person."

Mia goes on to say, the family at large is going through a hard time in light of this sad news.
Tisa used to be in showbiz back in the 1970s, but didn't nearly work as much as Mia -- and she certainly wasn't as famous either. Tisa was a teenager when she started acting in Hollywood, making her film debut way back in 1970 in "Homer," a hippie counterculture flick.
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