I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
Texas does not have a Legal Separation as some states do.
Either of you on separation may apply for child support or spousal support though. If your wife keeps the children she will be entitled to about 25% of your monthly income for child support, but you will be eligible for spousal support of about 20% to 25% of her monthly income.
You wrote: She also wants me to sign a document about not seeing other people when we have the children. I would not agree to do that. The court will not force anything like that ion you.
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I wish you and yours the best in 2016,