Śrīla Śrīdhara Svāmī quotes the following smriti injunction regarding inheritance: patnī duhitaraś caiva pitaro bhrātaras tathā/tat-sutā gotra-jā bandhuh śishyāh sa-brahmacārinah. “The inheritance goes first to the wife, then [if the wife has passed away] to the daughters, then to the parents, then to the brothers, then to the brothers’ sons, then to family members of the same gotra as the deceased, and then to his disciples, including brahmacārīs.”
Śrīla Viśvanātha Cakravartī adds that since Satrājit had no sons, since his wives were killed together with him, and since his daughter Satyabhāmā was not interested in the Syamantaka jewel, which constituted the inheritance, it rightfully belonged to her sons.
In Krishna, the Supreme Personality of Godhead, Śrīla Prabhupāda explains: “Lord Krishna indicated by this statement that Satyabhāmā was already pregnant and that her son would be the real claimant of the jewel and would certainly take the jewel from Akrūra.”