Manusmriti

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सपिण्डता तु पुरुषे सप्तमे विनिवर्तते । समानोदकभावस्तु जन्मनाम्नोरवेदने ॥ ६० ॥

sanskrit

But the Sapinda-relationship ceases with the seventh person (in the ascending and descending lines), the Samanodaka-relationship when the (common) origin and the (existence of a common family)-name are no (longer) known.

english translation

sapiNDatA tu puruSe saptame vinivartate | samAnodakabhAvastu janmanAmnoravedane || 60 ||

hk transliteration by Sanscript