Thread: house forclosed on , now the bank

My daughter and her husband moved to another state after trying for 2 yrs to sell their house. They tried keeping up payments on 2 houses but eventually couldn't so the house they moved out of was foreclosed on. Today they got a bill for $2500.
She is wondering, did they sell the house for that much less than what was still owed on it? And do they have to pay it?