Can you legally not pay a surrogate if one twin has demised?
All questions pertaining to the law should state which area is under question - is it for Quebec, Prague or Auckland, NZ?
I think that the moral and ethical implications of withholding payment would supercede the legal issues, but that's just me.
One of the risks involved in surrogate motherhood is the pregnancy itself. A natural pregnancy is dangerous; let alone an artificial one. Complications happen that can't always be avoided. It is simple fate that may lead you to miscarry, or acquire health problems from the pregnancy. Though using a surrogate motherhood agency is the safest way to go, no one can promise you that there will be no complications. http://www.surrogatemotherhoodonline.com/content/risks-surrogate-motherhood
Vanishing twin syndrome was first recognized in 1945. Vanishing twin syndrome is when one of a set of twin/multiple fetuses disappears in the uterus during pregnancy. This is the result of a miscarriage of one twin/multiple. The fetal tissue is absorbed by the other twin/multiple, placenta or the mother. This gives the appearance of a "vanishing twin." http://www.americanpregnancy.org/multiples/vanishingtwin.html