every family needs to own more than one gun...one per person perhaps.
though I wouldn’t wish a poodle shooter on any family.
a revolver...or a short barreled pump shotgun with appropriate indoor ammo would be the most reliable imho.
Food for thought: We need to be thinking beyond traditional notions of home defense. In a SHTF scenario, the only valid purpose of your civilian weapon will be to obtain a better weapon (i.e. a selective fire weapon). The vast majority of selective fire weapons in the USA are 5.56 “poodle shooters” based on the M16 platform. A stockpile for an AR15 will serve an M16.