Remington 870 Youth in 20 ga. Not too short for large folks, size and recoil easily handled by smaller statured folks, and even 7/8oz of shot is going to seriously mess up a bad guy's day.

Even with an improved choke, pattern spread is going to be less than 1' diameter at distances you would find inside most homes.

Ed

"Not in an open forum, where truth has less value than opinions, where all opinions are equally welcome regardless of their origins, rationale, inanity, or truth, where opinions are neither of equal value nor decisive." Ken Howell