When multiple husbands and wives become legal in the future, how will social security be affected?

Notwithstanding the Court increasing the ranks of social security when they do it again and people are in unions with multiple husbands, how will social security be affected? For instance, you have a man and his seven wives, if he is receiving social security and dies, normally his wife can draw that, but with 7, 10, or 12 wives etc. how that work will? Only the first wife gets it, does he have to specify in his will who get it, do all the wives have to divvy it up from his total SS income, will they each be entitled to the same amount even if it is more than what the departed put in through employment, etc.? Where would the feds come up with the extra cash once the qualifying recipients’ numbers expand again?