Texas Family Code - FAM § 3.102. Managing Community Property

(a) During marriage, each spouse has the sole management, control, and disposition of the community property that the spouse would have owned if single, including:

(b) If community property subject to the sole management, control, and disposition of one spouse is mixed or combined with community property subject to the sole management, control, and disposition of the other spouse, then the mixed or combined community property is subject to the joint management, control, and disposition of the spouses, unless the spouses provide otherwise by power of attorney in writing or other agreement.

(c) Except as provided by Subsection (a), community property is subject to the joint management, control, and disposition of the spouses unless the spouses provide otherwise by power of attorney in writing or other agreement.