Manusmriti
भ्रातॄणामेकजातानामेकश्चेत् पुत्रवान् भवेत् । सर्वांस्तांस्तेन पुत्रेण पुत्रिणो मनुरब्रवीत् ॥ १८२ ॥
If among brothers, sprung from one (father), one have a son, Manu has declared them all to have male offspring through that son.
english translation
bhrAtRRNAmekajAtAnAmekazcet putravAn bhavet । sarvAMstAMstena putreNa putriNo manurabravIt ॥ 182 ॥
hk transliteration by Sanscript