I’ve been following this thread with incredulity. It sounds like a doomed relationship and you probably will see your son again - eventually. Maybe even with your DGS, although this will depend a lot I think on your DiL’s parents. I believe that in China many GPs look after their GC for the first six months at least and usually its the husbands parents.
If your DS isn’t usually prone to telling porkies perhaps he’s just trying desperately to hold his marriage together. It’s something only he can sort out. I hope all turns out for the best for you - whatever the best is! 
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