From a book I read recently:
“What did Ingrid’s and her husband’s house represent for her?”
This sentence suggests that Ingrid and her husband have more than one house. If they share a house (which I believe they do), they should share the apostrophe ("Ingrid and her husband's house). They shouldn't both have an apostrophe. If they each have a house, then they would each have an apostrophe, and you would pluralize the noun:
"Ingrid's and her husband's houses"
See this post about compound possession for more info.
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