Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that some people came to Sayyiduna Ali (may Allah be pleased with him) and disputed about the child of a couple who had performed li'an. His father's children came, demanding his inheritance; Sayyiduna Ali (may Allah be pleased with him) gave his inheritance to his mother and made the mother his 'asabah (residuary heir).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12491