A woman tries to stop his husband from beating his son, she says to him “ if you want to beat our son, hit me first.” Does this sentence make sense? Is there any better way to express it?

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Answer

yes it makes sense.

also - "if you're going to hit our son, you'll have to go through me first".  this makes it sound the woman is putting herself, as a barrier, between her son and the dad.

Answer

Also, it should be HER huband, not his.