What happens if I contribute to the purchase of a house which will be in my soon-to-be husband's name and he subsequently dies?

Question Details: My future husband is buying his parents' home in IA. I'm selling my home in NE and I will add 1/4 to the house where he is paying for 3/4 of the house. The house will be paid off when I add my contribution. My name will not be on the house. He already has a Will and some other legal documents already established. Let's say in 5-30 years he passes away. Will I be homeless since everything is willed to his children and my name isn't on the house? What happens to the percentage I added to the home. What happens to combined household purchases after we are married? What happens to the material items we each bring to the home? We are both in our 50's, we each have a 401K and life insurance that will go to our own children. The house is the struggle because I can't add what he can.

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