Keep in mind the only Voidsent that seem to form familial or friendship based relationships are those that basically live in the Source full time. The Gruffs (Papa, Mama, and Little), Ultros and Typhon, the Continental Circus, gaelicat clowders, etc. Ones that no longer have to worry about the transactionality that rules voidsent lives as they're now self sustaining due to the non-Darkness aspected realm of the Source.