Brihat Parashara Hora Shastra
जीवात् पञ्चमगे पापे लग्नात् पञ्चमगेऽपि च । षड्त्रिंशे च त्रयस्त्रिंशे चत्वारिंशे सुतक्षयः ॥ २२॥
There will be loss of children at 33 and 36, if a malefic is in the 5th from Guru, while another is in the 5th from Lagn.
english translation
jIvAt paJcamage pApe lagnAt paJcamage'pi ca । SaDtriMze ca trayastriMze catvAriMze sutakSayaH ॥ 22॥
hk transliteration by Sanscript