Title issue for death without a will in Texas

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Here is the setting:

Husband dies.

He buys a home with wife and they had no children together.

Husband had 3 children former marriage. Two of which are not reachable.

On the deed it clearly states husband and wife.

The property was not probated and no will was made.

I assumed that the survivor spouse gets the property since it was own jointly as husband and wife. Now some closing agent is saying that the children of the former marriage needs to sign a deed as well. 

Anyone in Texas know more on this sort of thing?