Brihat Parashara Hora Shastra
एवं लग्नपदाद् विप्र तनयादिपदे स्थिते । मित्रामित्रे विजानीयाल्लाभालाभौ विचक्षणः ॥ ३५॥
O Brahmin, similarly mutual relationship, or gain, or loss through son etc. be known, based on Lagn Pad and the relative Bhava Pad.
english translation
evaM lagnapadAd vipra tanayAdipade sthite । mitrAmitre vijAnIyAllAbhAlAbhau vicakSaNaH ॥ 35॥
hk transliteration by Sanscript