"The older one is my mother."

Translation: 比较老的是我的妈妈。

[Yuxuan-Chen]

Your mom will 100% kill you if you dare to say that.

[eugenetehyj]

我的妈妈是比较老的

[crantila]

这是我写的

[DavidGao176768]

To me, this sounds like you're saying, "My mom is rather old," or "My mom is relatively old."

[PeaceJoyPancakes]

"老的是我母亲" (or "妈[妈]", which is more like "mom") would often be sufficient. The comparison can be implied in Chinese.

[NasuSamaruk0]

As EthwanChenobi pointed out, the sentence does not sound appropriate to the readers, including me and him as the proficient Chinese linguist. How about these sentences:

• 更老的是我的妈妈
• 更老的是我的母亲

[ivymew]

You don't have to include "的“ in this case. 我妈妈 alone is fine.

[KoalaWelli]

Agreed, 比较 means “quite” or “rather”, not “more”.