Throughout the book Tambu seem to suffer from nervous condition, Do you think her younger sisters will also suffer from this?

Netsai is Tambu's younger sister. I don't believe she'll ever suffer from Tambu's nervous conditions because she is well rounded, hard working, obedient, and she genuinely loves her family. The tasks she performs are performed not simply because she is subservient, but rather because she'd do the things she does regardless. Her actions come from love......