I'm bipolar.  I get moody.  There will never be a gun in any house I live in.  There is just too much chance that I will reach for an easy way out at an extreme moment.  If you have a family member with a temper, or mood problems (depression, bipolarity), or who is just irresponsible get a large dog.  It's damn hard to kill yourself or someone else with a dog, and they are a terrific deterrent against criminals.