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

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.