While you are still alive, you have control over where they go. Once you take the dirt nap, you don't. Its why all the family guns I've inherited are now living with my sons. Just more junk to clean and oil and worry about. I sent them where I wanted them to go. If my sons have a different view, they have control of the ones they've gotten. I'm even aware of some trading or loaning between them.
But the big problem will be the ones I still have that I've somehow managed to pick up over the years. I bought them because I wanted them. I paid anywhere from way too little to way too much. When I up and croak, my wife will probably do something stupid with them. I fully expect it. I've seen others in this situation and it causes great pain.
My long time gun show partner just decided to die about 10 years ago. He had some great guns and they gave him great pleasure and comfort. But right after he died, his widow called a gun shop and had them come and get them all. They paid her just a fraction of what I thought they were worth. I saw some of them sell way too cheap. For a long time I was upset over it.
But now I realize I can't control things. I used to visit that shop regularly and even managed to score some great guns at very low prices. At least one was an estate gun and I have no idea about another. But I bought that gun for about 1/3rd of its value. I even bought M70 #201 for a very nice price. Its kind of like buying at retail or wholesale.
So my instructions have been repeated to the point where my wife is telling me she'll do as she pleases after I die. The gauntlet has been thrown down. Both sons have wives that spend money and they have kids growing up. To them cash would be more important than 20 or 30 Randall knives or a couple of dozen collector grade guns. Neither would even consider buying that kind of thing on their own. Even if their wife would let them.... And what about things like paintings and glassware? She might keep that.
But the only way to control it would be to sell the junk now and blow the proceeds on hookers and blow.