Inherited vacation property sale

Years ago my sister and I inherited a vacation home from our parents.  We sold it last year.  I normally file jointly with my husband.  This year I'll be reporting the gain on the sale of the vacation home on our taxes.  My question is should I continue to file jointly?  My husband is on Medicare and I am concerned that this added income will affect his premium.  Since the property was something I inherited it doesn't seem right that it would affect his premiums.  Thank you!