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You can't technically force your husband to add you to the deed.....but if this house is your marital property, you have an equitable ownership interest in the property -- regardless of whether or not your name appears on the deed.
The only possible thing you could do to validate your ownership is to file a partition lawsuit, which could force the sale of the property....but this is generally done as part of a divorce proceeding.
But, as long as the house was purchased during the marriage, it will be considered marital property and you'd have an ownership interest in the property (likely 1/2).
However, if the house was purchased BEFORE the marriage, it could be considered his sole property.....but you could claim any money you've spent on paying the mortgage, etc. Here's a good link you can read: http://www.yalelawfirm.com/pdf/Texas%20Marital%20Property%20Law.pdf