The munthā's house — The third bhāva — Sahaja
Traditional interpretation — Parāśara transmission · BPHS, bhāva significations; Phaladīpikā II
Sahaja is the bhāva of the born-alongside: younger siblings, courage (parākrama), effort and enterprise, the arms and hands, skills of craft and writing, and short journeys. It carries two structural classes at once — upachaya, a growing house whose results the texts say improve with time, and triṣaḍāya, one of the three desire houses whose lords the tradition views warily. Classical opinion holds that natural malefics placed here lend nerve rather than harm, an upachaya peculiarity.
The reading is settled the usual way: the third lord's dignity and placement, any grahas occupying Sahaja, and the aspects it receives — those facts are carried by the computed chart beside this passage. A fortified third is read as initiative that finishes what it starts; a weak one as courage that needs borrowing. The chart says which account fits.