James Caan Divorce Not Without My Kid and Some Cash ... Wife Responds

EXCLUSIVE
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James Caan's estranged wife is firing back in divorce papers, and her message is clear -- our son's coming with me, Sonny!

Linda Caan filed her response to "The Godfather" star's divorce petition and she is demanding physical custody of their 16-year-old son Jacob. In his docs, James said he wanted to share physical and legal custody.  

The Caans also don't see eye-to-eye on money. According to Linda's docs ... she wants spousal support from Jimmy ... whereas he asked the court to terminate her right to spousal support.

As we previously reported ... we're told there is NO prenup -- so this one could get nasty.