4.1.163 जीवति तु वंश्ये युवा

Word by word (padaccheda)

In / when जीवति saptamī · ekavacanaIndeclinable तु avyayaIn / when वंश्ये saptamī · ekavacanaTerm / subject prathamā · ekavacana

In / when Saptamī (7th case): "in X" or "when X", a domain or condition.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".
Term / subject Prathamā (1st case): the term being defined, or the subject of the statement.

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Full reading

जीवति तु वंश्ये

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

But when one in a line of descent beginning with a father (and reckoning upwards) is alive, the descendant of a grandson or still lower descendant is called युवन् only.
The word वंश means an uninterrupted series of family descent-or 'a line'. One who occurs in such a line, like father &c, is called वंश्य ॥ When such a vansya is alive, then the descendant of a grandson &c is called Yuvan. The phrase पौत्रप्रभृतपत्य in the sutra should be construed as पौत्रप्रभृतेर् यद् अपत्यम्. 'He who is the descendant of a grandson &c' In the last sutra, however, this phrase पौत्रप्रभृत्यपत्यं was properly construed by putting the word पौत्रप्रभृति in the case of apposition with अपत्यम् meaning "a descendant being a grandson &c." Thus the word Yuvan will be applied to a person who is at least fourth in the order of descent, from the propositus with reference to whom the derivative is made. Thus गर्गः being the head, we have गर्गः

- अपत्यम् - गार्गिः (son or putra)
- अपत्यम् - गार्ग्यः (Gotra)
- अपत्यम् - गार्ग्यायणः (Yuvan)

(if Garga or Gargi &c be alive). The force of the word तु, in the sutra is that it will be called Yuvan only, and not Gotra as well.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.