ikisinin
Ikisinin is a Turkish genitive form derived from the numeral iki (two). It marks possession or association by two referents, functioning as the equivalent of English “of both” or “the two’s.” In usage, ikisinin precedes a noun in the genitive case to indicate joint ownership or affiliation, and the ending is chosen to fit Turkish vowel harmony, with ikisinin being the common realization.
In practice, ikisinin is used when discussing something belonging to two people or things. For example, Ikisinin
Notes on usage: ikisinin is the general and widely accepted form for indicating joint possession by two