I'm sorry to be the bearer of bad news, but please read:
California is a community property state. Except as otherwise provided by statute, all property, real or personal, wherever situated, acquired by a married person during the marriage while domiciled in this state is community property.
Separate property is not included in the division of the community estate.
Separate property of a married person includes all of the following: (1) All property owned by the person before marriage.
However, here is one of many factors that are considered by states applying principles of equitable distribution:
Services as a Homemaker. Courts recognize that keeping a home and raising children are work. In addition, one spouse’s work as a homemaker often enables the spouse who is working outside the home to earn more money. Thus, services as a homemaker are a factor in favor of the homemaker. Some courts also apply a related concept of considering whether one spouse had impaired her or his earning capacity because of working as a homemaker. If a party can show his or her work as a homemaker resulted in missing the opportunity for training or for job experience that could have resulted in higher income, that factor can favor giving more property to the homemaker-spouse.
Also, for the determination of spousal support, the assets (including separate property) are considered. So are many other things, for which many are in your favor. Google search California divorce laws or consult a lawyer.
Since he owned the house before you were married, legally it is his. If you love him and you want to stay married to him, you need to convince him to take you to the title company and add you to the deed. That is the fair and right thing to do since (although not legally) you do own half of that house because you contribute at least half to it as well. But do keep in mind that if your name is now on the deed and you do divorce you need to force him to refinance in his name only again because if he continues to live in the house and stops paying the mortgage than you may be responsible for it as well.
Perhaps selling that house and buying one together might solve this issue as well and should be considered. It would give you a fresh start as a family and perhaps a new perspective on your marriage.
That is really crappy that he treats you that way. Obviously he has issues and it is good that he is trying to fix it, but I do think he needs more than one day of anger management. A lot of men think that stay at home mom's don't contribute, they just don't get it. You are not alone. You DO contribute, the house theoretically is half yours, and you deserve better treatment than you are getting. His family has no business getting involved in your marriage either, and there are creative ways to politely but firmly let them know that.
Marriages are not easy, they are a lot of work. Keep working at it and as frustrated and irritated as you are, stay pleasant and be nice to him. Only you can control how you feel and act. What you say and do will either add to the tension in your marriage or it will help keep things running smoothly and happily. It's your choice.
Good luck to you, and start praying for him.
Edit: I just read Suz T's answer and it reminded me of a Suze Orman show I saw (or maybe she was on Oprah that day), and if I recall correctly she suggested that you open a savings account and put all extra money you get in it. You should have your own security 'nest egg'. If there is a way to get an account in someone else's name, like a sibling, your mom, etc. do that so you then don't own it and he would have no knowledge of it. You can deposit money into it but would need them to get it out. It must be someone you trust completely and do not tell anyone (not your kids, not even your friends) about it. And make sure you don't leave deposit receipts laying around the house. It may feel sneaky and devious at first, but it's your right to feel comfortable about your financial future.