Grandpa slowly stood up. Dont ever say goodbye, Billy. Dont ever give in to the sadness and the loneliness of that word. I want you to remember instead the joy and the happiness of those times when you first said hello to a friend.

请问: of that word 和 of those times 中的 of 都是关于的意思吗?

Grandpa slowly stood up. Dont ever say goodbye, Billy. Dont ever give in to the sadness and the loneliness of that word. I want you to remember instead the joy and the happiness of those times when you first said hello to a friend.

【翻译】爷爷慢慢地站了起来。“不要说再见,比利。不要屈服于那句话表现出来的悲伤和孤独。相反,我期望你记住当你首次向朋友问好时的快乐和幸福。

that word 可以是那个词,也可以是那句话。of that word 作定语,修饰the sadness and the loneliness 。意为“那句话表现出来的悲伤和孤独”。

those times 是那些时日/时候, of those times也是作定语,修饰the joy and the happiness,在those times 后面跟了一个定语从句:when you first said hello to a friend。

从翻译可以看出来,of 表示所属关系,不是“关于”。