This is the 4448th most frequent Turkish word.
annelerinin
"Of their mother(s)"
Here, 'annelerinin' is the possessive form, 'their mother's,' indicating possession of the birthday.
Çocuklar annelerinin doğum gününü kutladılar.
The children celebrated their mother's birthday.
In this sentence, 'annelerinin' denotes 'their mother's,' showing possession of the suggestion.
Arkadaşlar, annelerinin önerisini dikkate aldılar.
The friends considered their mother's suggestion.
'Annelerinin' here describes 'their mother's,' indicating possession of the food made by their mother.