Welcome Preppers and Survivalists,
When it come to firearms, you and your family will hear a lot of different opinions. Some will come from so-called experts while others will come from non-experts.
Then, ... Some will come from people like me, life-long learners that are just like you.
Empty Cases - Experts, Firearms Instructors, and Gun Writers
With that said, here are some suggestions, from me.
First, the handgun for defending you and your family. Get yours first! (You're the one reading this, so you must be the most serious about defending your family from villains) then a handgun for your partner. Next, are your children.
I suggest standardizing on a double-action .357 magnum revolver. They are rugged, inexpensive, and they don't require a lot of equipment (usually, magazines) like pistols.
Next, purchase a defensive rifle. I suggest the SKS rifle for the same reasons as the .357 magnum revolver, rugged, inexpensive, and ...
Add ammunition (250 rounds for each revolvers and 1000 rounds for the rifles) then get some training from knowledgeable family or friends.
Just remember to take in consideration the above article.
Handgun Shooting Stance
Some folks aren't going to have access to knowledgeable friends or family, so you're going to have to learn from the internet or me
American Rifleman - Choosing a Handgun Shooting Stance
I was kind's disappointed with the previous article, no pictures.
Empty Cases - The Weaver: Explained