As discussed in this accepted QnA, that Śrī Rāma maintained 'Eka-patnī-vrata'.
My question is:
Did Śrī Rāma's three brothers viz. Bharata, Lakṣmaṇa & Śatrughna too, pledged with the 'Eka-patnī-vrata'?
If not, what's the story/information on the 'other-spouses' of the other three brothers?