前田さんのお父さんが死にました。

[healer]

I've come across quite a few sentences as follows written in the pattern where the noun that goes with が belongs to the first noun that goes with は.
田中さんは顔が丸いです。
田中さんは丸い顔をしています。
田中さんは大きい目をしています。

So I wonder if the following correct grammatically for the meaning the same as the topic?
前田さんはお父さんが死にました。

 

[Toritoribe]

That works only in a specific context.
e.g.
昨日の地震で、佐藤さんは、お母さんがけがをしました。前田さんは、お父さんが亡くなりました。

There's a well-known sentence 僕はウナギだ. This doesn't mean "I'm an eel" in a fairy tale or something (yes, it can mean so, of course). A famous linguist 奥津敬一郎 gave this example to explain the function of は. He said that this is commonly used in a conversation as "unadon (bowl of eel and rice ) please" when ordering dishes in a restaurant. It's naturally interpreted as 僕はウナギを注文します from the context. Similarly, 佐藤さんは and 前田さんは means 佐藤さんについては and 前田さんについては in the sentence above, respectively.

 

[healer]

僕はウナギだ

It could be translated as "As for me, it's eel."
I read Tae Kim's Guide to Learning Japanese. He argues that は is a topic marker best translated as "as to", not simply "be or is or are". I can relate to what you say, all about context again. So could you tell me if the sentence 前田さんはお父さんが死にました grammatically correct standing on its own. Thanks!