Husband owned house for 25 years before marriage.

Got married and has lived in house with wife for 15 years.

House is deeded as Fee Simple in Husband's name.

House is paid off. Wife has never contributed towards past mortgage or upkeep as she has no income.

Husband is much, much older than wife and will likely die before her.

Husband has no children. He does have family and has mentioned in the past that he will leave his house/estate to his sister.

Does the wife have any claim to the house if he dies because she has lived there for so long?

I am assuming if he has no will, she can lay claim. But what if he does have a will and leaves it to someone else in his family? Does she have any claim based on domicile or occupancy?

I've suggested this might be an issue but she seems to believe her length of occupancy in the house as his wife gives her rights to it.

I am having trouble finding info online about this scenario.