Mother died, three children hike north

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This is set early in the 2000s. A families Mother dies and the children's only living relatives are somewhere north. I think this story starts out in northern Florida or Georgia and they have to hike to somewhere on the middle east coast, or even Maine perhaps. It is a harrowing journey for them and that is all I can remember.

I'd like to read it again.

Thanks
Gwen

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