This is the 4402nd most frequent Turkish word.
ailesine
"To his/her/their family."
Here, 'ailesine' denotes the dative case usage of the root 'aile' (family), expressing for or to someone's family.
Ahmet, tatil için ailesine hediye almayı planlıyor.
Ahmet is planning to buy a gift for his family for the holiday.
In this sentence, 'ailesine' indicates the dative case, showing Ayşe's attachment or feelings toward her family.
Ayşe, ailesine olan sevgisini her zaman göstermeye çalışır.
Ayşe always tries to show her love to her family.
This usage of 'ailesine' serves as a dative, indicating that the action of informing is directed toward his family.