Brihat Parashara Hora Shastra
चन्द्रारयोर्बली खेटो मातृकारक उच्यते । भौमतो भगिनी श्यालः कनीयान् जननीत्यपि ॥ १९॥
The stronger among Sūrya and Śukr indicates the father, while the stronger among Candr and Mangal indicates the mother. Mangal denotes sister, brother-in-law, younger brother and mother.
english translation
candrArayorbalI kheTo mAtRkAraka ucyate । bhaumato bhaginI zyAlaH kanIyAn jananItyapi ॥ 19॥
hk transliteration by Sanscript