You must ask one or other of your parents.

感觉这里的 other 应该是特指。盼专家老师就此为学生解惑。

【答】《麦克米伦高阶英汉双解词典》对 one or other 的解释和例句如下： one or other Br E 【英】one of two people or thing, when it does not matter which you are referring to （两者中）或者这个或者那个：They tried to ensure they weren't both working at the same time, so that one or other of them would be there to look after the boys. 他们想办法确保两人不同时上班，这样他们中总有一个能在那儿照顾这些男孩。

【注意】在 one or other 这个短语中，没有定冠词。