Brihat Parashara Hora Shastra
जीवेन सहिते चोच्चे ज्ञेया द्वादश सोदराः। तत्र ज्येष्ठद्वियं तद्वज्जातकाच्च तृतीयकम्॥ १०॥
If Sahaj‟s Lord is in an angle, while the significator (Mangal) is exalted in a trine and be yuti with Guru, 12 will be the number of total co-born.
english translation
jIvena sahite cocce jJeyA dvAdaza sodarAH। tatra jyeSThadviyaM tadvajjAtakAcca tRtIyakam॥ 10॥
hk transliteration by Sanscript