Ultimately, the death of Tiberius' son elevated her own children to the position of heirs. Her sons were the logical choice, because they were the sons of Germanicus and Tiberius' grandsons were too young. Nero was becoming popular in the Senate due in part, Tacitus says, to his resemblance with his father. The rise of her children was threatening to Sejanus' position. Resultantly, Sejanus began spreading rumors about Agrippina in the imperial court. The coming years were marked with increasing hostility between Sejanus and Agrippina and her sons. This effectively caused factions to rise in the aristocracy between her family and Sejanus.