The Voice (Ju Men, 巨门) in the Siblings palace (Xiong Di, 兄弟)

What the classic says, Zi Wei Dou Shu Quan Shu (紫微斗数全书), volume two

Well placed, two. Badly placed, half-siblings, and better living apart. With the Sun (太阳) and the two Aides and the Scholar and the Artist (左右昌曲), three; with the Strategist (天机), two, and more at odds; with the Blessing (天同), two or three. With the six malefics, solitary and harmed.

巨门庙旺二人，陷地，各胞有，宜分居，太阳同加左右昌曲有三人，天机同有二人，更乖违不一心，天同二三人，加羊陀火铃空劫孤克。

“Well placed” and “badly placed” refer to the star’s brightness in the branch the palace falls on: the same star in the same palace reads differently bright and dim, and the clause says how.

Source

And in the chapter of questions on the stars (Zhu Xing Wen Da Lun, 諸星問答論)

kin who do not align. stars that never meet (參商) are two stars that never share the sky

在兄弟則骨肉參商

How this placement actually turns up

• Well placed (exalted or strong) in 68% of those charts, badly placed (fallen) in 17%, in between the rest.
• Alone in the palace in 51%; sharing it with The Strategist (天机) 17%, The Sun (太阳) 16%, The Blessing (天同) 15%.
• Carries a birth-year transformation in 31%: Fortune (化禄) 11%, Power (化权) 10%, Trouble (化忌) 11%.
• How often the conditions the classic’s line names actually occur — one of the four difficult stars (擎羊陀罗火星铃星) in the palace with it: 30%; Earth Void or Earth Robbery (地空地劫) with it: 15%; one of the six helper stars (左辅右弼文昌文曲天魁天钺) with it: 41%.

Counted by casting every day from 1950 to 2009 at each of the twelve hours — 262,980 charts, 8.3% of which have The Voice here (every main star sits in every palace in about one chart in twelve). A count, not a reading.