Al-Sha'bi narrates from Sayyiduna Ali and Sayyiduna Ibn Mas'ud (may Allah be pleased with them both) that they said: "The agnatic heirs ('asabah) of the child of a woman subjected to li'an are the agnatic heirs of his mother."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9628