Brihat Parashara Hora Shastra
शनिराहू त्रिलाभस्थौ पदाद् भ्रातुर्विनाशकौ । ज्येष्ठस्यैकादशे तत्र कनिष्ठस्य तृतीयके ॥ ३१॥
Co-born form Lagn Pad (up to Sloka 36). Rahu and Śani in the 3rd, or the 11th from Lagn Pad will destroy the co-born of the native. Rahu and Śani in the 11th will indicate the destruction of elder brothers and/or sisters and in the 3rd younger ones.
english translation
zanirAhU trilAbhasthau padAd bhrAturvinAzakau । jyeSThasyaikAdaze tatra kaniSThasya tRtIyake ॥ 31॥
hk transliteration by Sanscript