(CNN) As firefighters battle deadly wildfires across Northern California, families are desperately searching for missing relatives.

Christina Hanson was one of those missing loved ones. The 28-year-old, who used a wheelchair, lived in an apartment next to her father's house in Santa Rosa, California.

Christina Hanson

Her father, Michael Hanson, somehow made it to a hospital. But the family hadn't heard from Christina since early Tuesday.

Christina called Michael Hanson's ex-wife around 1:30 a.m. and told her she saw flames. She was frightened because she couldn't reach her dad, said Christina's aunt, Cathy Riordan.

As flames rose, neighbors told the family they grew concerned and called 911 to the property. But no one knows for sure what became of those emergency calls, Riordan said.

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