有奶便是娘

1. • lit. whoever provides milk is your mother (idiom)
2. • fig. to follow whoever is feeding you
3. • to put one's loyalties where one's interests lie

Character by character

• 有(yǒu)have
• 奶(nǎi)breast
• 便(biàn)plain
• 是(shì)be
• 娘(niáng)mother