Texas divorce laws???

my dad and my stepmom are getting a divorce. they have been married for 7 years, and have no children together. My dad has 3 kids of his own from his previous marriage and he makes a good living. My stepmother used to work at a low income job (didnt contribute much to the household) but later quit and now has no job. How much of my dad's money will my stepmom walk away with (percentage)?????