As a foreigner there is no obligation to help out your partner’s family. The decision has to be yours and yours alone, myself I help when I can as we are a family. But I know many an expat who moves the partner away from her relatives etc. as such that expat would have little to no bond with the family at all.
The only concern then would be the effect on your wife/girlfriend especially if they knew you could help and refused. My view on it is that it all depends on circumstance and as such can only comment on my personal view.
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