Manava Dharmashastra 9.191

9.191

dvau tu yau vivadeyātāṃ dvābhyāṃ jātau striyā dhane
tayor yad yasya pitryaṃ syāt tat sa gṛhṇīta netaraḥ //

But if two (sons), begotten by two (different men), contend for the property (in the hands) of their mother, each shall take, to the exclusion of the other, what belonged to his father.