That'll be fun.
It's a little known fact that the Spanish Constitution only has 7 amendments.
Insanity
At least the Spaniards are good at building military hardware;
https://www.defensenews.com/naval/2018/07/26/whats-the-problem-with-spains-new-submarine/
Think of this. This is really a lawsuit against the first wife by the second wife. My understanding is that its one family. So this would be a lawsuit of one wife against her family. So, I am thinking that the money going to the first wife leaves the second wife out in the cold. And of course there are children, maybe from both wives. I assume there is a will as well. How are the rest of the holdings split? In some countries the wife cannot be taken out of the will. That does not consider two wives. And in a male dominated society, is the first wife letting her brother, father or son handle the money for her. And they are unwilling to maintain the second wife. Lots of issues.
I could never understand why a man in his right mind would actually marry two women. I can see being married and some men have affairs and even some wives allow men to have girlfriends. But one wife is enough. Two wives or more would totally drive me insane, especially in the same house.