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I am sorry to hear about your situation, but unfortunately, Texas state law does not delegate how the parties share and invest finances. The Court simply does not get involved in private financial matters unless there is a divorce or separation.
So there is no legal way to force the issue and the parties have to work it out themselves.
The third party money manager answers only to who is on the account. If both of you are, then the money manager should answer to either. If only her, then only to her.
If you advise the money manager that you and your wife are not in agreement, then the money manager would say "okay, but I will follow the directions of whosoever name is ***** ***** account."
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