Suppose one wanted a shotgun for mostly home defense purposes - what's your recommendation for one that might also suit a spouse or teenage son should that need occur?That's simple. Which shotgun is in your closet right now? That's the one you want.
However, if you're looking for another shotgun, that's easy too. Remington, Mossberg, Winchester, all make good pump shotguns. I've got a Remington 870 standard that I've carried for years. Mine has the 20" rifle sighted barrel. However, if I were looking for a dual-purpose shotgun today, I'd probably look at the Remington 11-87 Youth Compact in 20 gauge. That 21 inch barrel makes it very versatile.
Or, I'd go with one of the Mossberg Bantam series. Either of those would work fine for a multi-purpose home defense/sporting shotgun for a teen son or a spouse.