The Brahmana can take three wives. The Kshatriya can take two wives. The Vaishya should take a wife from only his own caste. The children born of these wives should all be considered as equal.
तिस्रो भार्या ब्राह्मणस्य द्वे भार्ये क्षत्रियस्य तु। वैश्यः स्वजात्यां विन्देत तास्वपत्यं समं भवेत्॥