Devibhagavatapurana 2.3.9

2.3.9

mṛte vicitravīrye tu satyavatyatiduḥkhitā |
vadhūbhyāṃ golakau putrau janayāmāsa sā katham ||

Again on the demise of Vichîtravîrya, Satyavatî became very much grieved and got two sons born of her two son's wives by Vedavyâsa? How can we explain this fact? Why did she do this? Why did she not give to Bhîsma the kingdom? Why did Bhîsma not marry? And how was it that the elder brother Vyâsa Deva, of indomitable valour, did such an irreligious act as to beget two (Goloka) sons from the wives of the brothers? Vyâsa composed the Purânas and knew everything of religion; how then did he go to other's wives, especially, of his brother's wives?