Brihat Parashara Hora Shastra
भ्रातृस्थाने शशियुते केवलं पुङ्ग्रहेक्षिते। सहजा भ्रातरो ज्ञेयाः शुक्रयुक्तेक्षितेऽन्यथा॥ १३॥
If Candr is lonely placed in Sahaj Bhava with Drishti of male Grahas, there will be younger brothers, while the Drishti of Śukr denotes younger sisters.
english translation
bhrAtRsthAne zaziyute kevalaM puGgrahekSite। sahajA bhrAtaro jJeyAH zukrayuktekSite'nyathA॥ 13॥
hk transliteration by Sanscript