Who Gets Custody If Mother Dies But Father With No Custody Is Alive?

My sister in law has a daughter with her ex husband. SIL has full custody, but dad didn’t do anything wrong. He isn’t the brightest and didn’t try to fight her on custody. A few years back she told my husband and I that we will get her daughter if something ever happened to her. SIL got married to a new man since then. SIL is recently in hospital and they aren’t sure what’s going on with her. I’m sure she’ll be fine but it made something occur to me… If she passed, would we really get the daughter? Wouldn’t she go to the baby daddy? I understand that nobody can tell me for sure without knowing her will but just curious what people think.
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