You have a gun? No rioter in this planet walks towards bullets flying their way.
You might want to get a shootgun and some less than lethal ammo. Police use it with good results to get rid of stupid crowds.
About sending your wife away. Rioters rarely break into homes, they prefer stores with lots of crap to loot. Now if some get ballsy, I assure you a couple shots sends them away (usually towards places to loot where they dont risk getting shot). If you send your wife away she might get caught in the middle of a riot, or attacked while traveling.
Traveling is MUCH more dangerous than staying home, even if the home is located right in the middle of the rioting city.