3 words riddle

肉紅色，聯兩代，非裙帶。
公斷人, 斷黑白，要分明.
樹蔭下，人生氣，臉氣綠.

Red meat, together two generations, non-crony.
Umpire, off black and white, should be clear.
Under the shade of a tree, people angry, face green gas.

(one is in)