Brihat Parashara Hora Shastra
यथा लग्नात् फलं चैतदात्मनः परिकीर्तितम् । एवं भ्रात्रादिभावेषु तत्तत्सर्वं विचारयेत् ॥ ७॥
Just as these effects are derived from Tanu Bhava in regard to the native, similar deductions be made about co-borns etc. from Sahaj and other Bhavas.
english translation
yathA lagnAt phalaM caitadAtmanaH parikIrtitam । evaM bhrAtrAdibhAveSu tattatsarvaM vicArayet ॥ 7॥
hk transliteration by Sanscript