Manu has said that there are five kinds of sons, namely those begotten by one on his wife, those obtained from others, those purchased for a price, those reared out of affection and those begotten on other women.
स्वपत्नीप्रभवान् पञ्च लब्धान् क्रीतान् विवर्धितान्। कृतानन्यासु चोत्पन्नान् पुत्रान् वै मनुरब्रवीत्॥