[Grammar] Isobel, whose brother he was, had heard the joke before.

[kadioguy]

Isobel, whose brother he was, had heard the joke before.

https://www.oxfordlearnersdictionaries.com/definition/english/whose?q=whose+
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1. Is "whose brother he was" from the following?

he was Isobel's brother
→he was whose brother
→whose brother he was

2. "Isobel" is a feminine given name, so "whose brother he was" means that "he" is her (Isobel's) brother. Am I right?

(Update) I just found this thread:

https://ell.stackexchange.com/quest...ce=google_rich_qa&utm_campaign=google_rich_qa

 

[jutfrank]

Yes, you're right. Isobel is his sister. What a badly phrased sentence.