[Avodah] Going swimming with your sister

[Marty Bluke]

I always thought that brothers and sisters (even teenagers) could go mixed
swimming privately just the immediate family because we assume that there
are no hirhurim among immediate family members. However, I listened to the
Headlines podcast where he interviewed an Israeli posek from Machon Puah
who claimed that it was forbidden.

Anyone have any sources? Piskei Halacha from modern poskim?
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