Sure I would be willing to sell some passed down guns, assuming they held no sentimental value and would be more than willing to sell of those that had bad memories/associations with them. For example, I have a COP (4 barrel in .38 spl) that belonged to my brother. He only got it because it was an oddity. He never carried it and apparently only shot it a couple of times. So, I have no need for it and it has no sentimental value.
Not real life for me, but would you want a gun your father used to kill your favorite dog? Would you want a gun wrongly discharged (ND, AD, UD) that killed a family member? Would you want a gun used in a suicide?
I have some sentimental guns. They are virtually all safe queens. One of my favorites is a S&W revolver that was my pop's issued sidearm when he joined the Dallas Police Department in the 1950s. Later, it did duty as the under-the-counter gun in our family business. Pop is still alive, but alive or dead, I would not part with it willingly. I don't even like revolvers, but it does have a cool family history.