wow. this is one of the weirdest threads i've read in a loooooong time. what is goin' on?!
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op, it sounds like things are blowing up between you & him. it's unlikely that he can make you leave the house without a court order, which is probably months away at the soonest, possibly not until the divorce is final. however, long-term, it does make sense that you would be the one to leave the house. it was his before you married, he co-owns it with someone else, and financially it often doesn't pan out for either half of the couple to remain in the family home anyway. often both parties have to downsize. another thing to think about is how unpleasant it would be to stay in the house with him throughout the divorce - unpleasant and stressful for everyone, not just the grown-ups. do you have any option to stay with family or a close friend during that transitional period, until you get on your feet?
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once you start working and know what your income and expenses look like, it will be easier to figure out what resources you can put toward housing. if you feel like you already have a firm idea of what your income will be, you could try working on a budget in the frugality & finances board. you may also be able to figure out an estimated child support amount based on his income, your potential income, number of children, cost of daycare, etc, by searching for a child support calculator for your state. however, depending on his work situation (like if he's self-employed or gets cash under the table) and how easy it is to enforce cs orders in your state, it may not be wise to count on it as part of your income.
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another thing to look into is how your state normally handles custody. it's unlikely that he would get primary physical custody, but some states are 50-50 by default. is that something you're emotionally prepared for? some states also limit your ability to move away from the non-custodial parent. just things to be aware of.
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of course, it would be best to talk with a family lawyer (or several) to get a better idea of how things work in your state and to know what steps you need to take to protect yourself and your kids. that's generally at the top of the to-do list. however that doesn't mean you can't get both support and some useful information online.