Louisiana Succession Laws...Family feuding over money!?

Yes, if the other two decide to she then the one who was living there can counter-file against them. That does not mean it is as cut and dried as it may seem. Since all 3 names were on the house technically they are all entitled. The one can fight it though and hopefully the judge will see the others were not helping but, in there defense they can say "we didn't because we weren't the ones getting use of the place" they can also say that it was agreed that since that one lived there then that one would be respinsible. Although, the Judge may not like the fact of them trying to get all this money from a place they did nothing for. So, as far as a law to protect the one who lived there, there is nothing cut and dried. There name was on the deed and so they are part owners. Although, my advice would be to fight this and it is a very good chance it can be won. Especially since they do not need this other part of the money.