Storage Space?

My husbands mother and father died 12 years ago a month apart. Those months were very hard for him. We have a big huge basement and he has kept alot of his parents stuff, bed, drawers, blankets, pictures, puzzles... etc. We have had some financial problems lately and are downsizing into a smaller home. In the next home we won't have a big basement or attic, and the stuff isn't very pretty it's all early 20th century stuff, so I don't want to decor our house with it. We can't afford a storage container, and there is alot of stuff I don't know why he keeps, like his mothers toilet scrub. I don't want to hurt him and say it's junk, he doesn't want to throw it away, but he doesn't want to decor our house with it either. So what do I do? We wont have this big room for all this stuff in our next house! Please Help!