You and your best friend get into trouble with the mafia

The mafiosi offer you the choice:
>either they execute your brother (since he is the biggest culprit), and only let you go with the chopping off of a few of your fingers
>or you both become their informants, living freely in a new place, but pretending to be husband and wife (YOU are chosen to be the wife, and a mafia doctor (he can perform ‘miracles’) would perform all necessary procedures on you)
What would you choose?