apple of someone's eye

idiomatic

(idiomatic) A favourite, a particular preference, or a loved one; the object of somebody's affections.

Japanese Meaning

最愛の人、最も大切な存在 / 誰かが特に愛情を注ぐ対象、心から好む人またはもの / 特に好まれる対象、至極に好むもの

At family gatherings, the youngest grandchild is always the apple of someone's eye.

家族の集まりでは、末っ子の孫はいつも誰かにとって目に入れても痛くないほど大切な存在です。

Sense（1）

(idiomatic) A favourite, a particular preference, or a loved one; the object of somebody's affections.

Sara was never the same after losing her daughter, the apple of her eye.

apples of someone's eye

（ plural ）