Domestic roommates

My sister and her boyfriend moved to Florida about 2 years ago. They live together in a brand new house that has only his name on the ownership title. The bills are split 50/50, including the house payments. She purchases most of the furniture. At his time, he will not consider marriage, and this leaves her with many doubts,If something should happen to him, will she have any claim on the house or any property they purchased together while living together. He was married before, and my sister was told that his ex-wife will have the legal claim on the house, even though they are legally divorced and his ex-wife's name is not on any legal document. He does have minor children. Can they make a claim on the property?
Please help, as my sister is really depressed of the whole situation, wondering if she will be left without anything, if her name is not included on any legal documents.
Thank You

[FarmerJ]

If he wont marry her they still can see a atty to help them set up the same kinds of things that many gay and lesbian couples often do regarding property and there intentions of covering the other person in there relationship . His ex can make no claim to benefit herself if he died . The children would be his heirs . SO if they go to the links up top and locate a atty who has helped gay or lesbian folks set up Domestic partnership agreements regarding real estate fair odds are that they will be able to get all of there intentions regarding each other into writting so there wont be too much hassle should a death occur . Tell her that if he were willing to go through this kind of setup for his relationship with her that she shouldnt be so worried about marriage , so many married people these days end up divorcing that the commitment means nothing . but atleast domestic partner agreement between them would give her some assurances if he died as to where she stood regarding the property .

I am not an attorney, but in Ohio, though my name is on the title of mine and SO's house, if he died, his family could claim his half of the house ... because we're not married! This is from my SO's BIL, who is an attorney in Toledo.

So I would have your sister check into this more thoroughly. I am curious, though, if they bought a house together, why wasn't her name put on the title?