Valmiki Ramayana Ayodhya Kanda Sarga 26 Shloka 32

शेषाः the rest of them, या मम मातरः my mothers, ते to you also, नित्यम् always, वन्दितव्याः should be respected, मम my, मातरः mothers, स्नेहप्रणय सम्भोगैः with love, affection and service, समाः हि are equal.

In terms of love, affection and service, the rest of my mothers are all equal. Therefore, you must pay them due respect regularly.