3 siblings sold moms house under 6 months after death. each rec a 1099-s with the total net proceeds amount, what do we show in net proceed amount in investments?

so mom passed away 5/29/2017 we sold her house on 11/21/17.  we all three received a 1099-S showing the same Gross Proceeds amount of 51,666,68 yet we split the proceeds.  Do we have to all three show the gross proceeds or just the portion we received.