Paul responded to me:

<<> d-is-a-s
> /sister-genitive-epenthetic vowel-dative/
> "to something belonging to one's sister"

The morpheme for "sister" is /d/?>>

Why not?  The morpheme for "to be" in Latin is /s/ (the /e/'s are epenthetic in "esse").
In the nominative, the Georgian word for sister is /da/.  Whenever a case-ending that
begins with a vowel is attached, though, that /a/ drops out.  The full paradigm is:

Nom.: da
Acc./Dat.: das
Gen.: dis
Instr.: dit
Erg.: dam
Adverb.: dad

Nom.: debi
Acc./Dat.: debs
Gen.: debis
Instr.: debit
Erg.: debma
Adv.: debad

I'm leaving out the vocative on purpose.  Also, the ergative case is often called the
"narrative" case (because it's only used in the past tense).

"sunly eleSkarez ygralleryf ydZZixelje je ox2mejze."
"No eternal reward will forgive us now for wasting the dawn."

-Jim Morrison