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(Replace /yuSm /asm with tva त्व ma म) before affixes and when ibc (when they mean one person).

In other words —

Before affixes and when ibc, (replace singular /yuSmad- /asmad- with /tvad- /mad-).

/yuSmad- + /cha
→ tva त्व + ad अद् + Iya ईय
→ tvad त्वद् + Iya ईय
→ tvadIya- त्वदीयॱ "thine"

/asmad- + /Gas + putra- पुत्रॱ
→ /asmad- + putra- पुत्रॱ
→ ma म + ad अद् + putra- पुत्रॱ
→ mad- मद् + putra- पुत्रॱ
→ mat-putra- मत्पुत्रॱ "my son"

What if they mean many people?

Nothing special happens then —

!**asmadIya- अस्मदीयॱ "ours"

!**yuSmadIya- युष्मदीयॱ "belonging to y'all"

And when they mean two?

See <6 yuvAvaudviv....