You can file a joint return for the year of the death.
Normally the house would transfer to spouse on a death (but depends how it was deeded).
Many are taking the new higher standard deduction this year so the house may or may not help.
I assumed you already filed but look at the Sch A for 2017 and if it is over $24,000 you might want to look closer at this.
Sorry for your loss.