text: Did he (your mother's spouse) sign anything at the hospital stating that he would be resposible for the medical bills?  If he did then a prenup can't help.  Honestly, prenup or not his credit can be at stake here if they own a home together.  A lien can be attached to the home and even if the lien is entirely in your mother's name, you father could still have to pay off the lien with interest and court costs and attorney's fees before selling or refinancing said home.  Its called a lien on real and personal property.  \n\nI would just make payment arrangements with the hospital and dutifully pay it.  If your mother is not in the position to do so, maybe her spouse will lend her the money and she can pay him monthly or add to the pernup that he gets something equitable in return, in the event of a divorce.\n\nOnce again, I REPEAT, if he did NOT sign ANYTHING at the hosipital then he is can NOT be held financilly responsible in most states.\n\nGood Luck and Take Care