family tree

NOUN /fæməli_tri/
11 LETTERS · 3 SYLLABLES · STARTS WITH F

family tree is a valid 11-letter word worth 18 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
F4A1M3I1L1Y4T1R1E1E1
4 + 1 + 3 + 1 + 1 + 4 + 0 + 1 + 1 + 1 + 1 =18 PTS
DOUBLE WORD → 36TRIPLE WORD → 54
MEANING

What does family tree mean?