Pāṇini sūtras

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 Yuvan only.

1. jīvatiजीवति

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   jज्	jīvजीव्	jīvatiजीवति	beबे	jīvजीव् + plus atiअति

2. tuतु

   Part	Lexeme	Sandhi form	Meaning	Stem
   tत्	tuतु	tuतु	but	tuतु

3. vaṃśyeवंश्ये

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	vaṃśyaवंश्य	vaṃśyeवंश्ये	ancestor	vaṃśyवंश्य् + plus eए

4. yuvāयुवा

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   yय्	yuvanयुवन्	yuvāयुवा	yuvanयुवन्	yuvयुव् + plus āआ

Anuvṛtti

1. apatyamअपत्यम् 4·1·92

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	apatyaअपत्य	apatyamअपत्यम्	child	apatyअपत्य् + plus amअम्

2. pautra+prabhṛtiपौत्र+प्रभृति 4·1·162

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	pautraपौत्र	pautraपौत्र	grandson	pautrपौत्र् + plus aअ
   pप्	prabhṛtiप्रभृति	prabhṛtiप्रभृति	etc.	prabhṛtप्रभृत् + plus iइ