Well, they’re not related per se, but Hook did have a relationship with Neal’s mother Milah, and Neal is Emma’s son. So biologically, no relationship between Emma and Hook…emotionally, a very very complicated and weird one.
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Keeper of Belle's Gold magic, sand dollar, cloaks, purple FTL outfit, spell scroll, library key, copy of Romeo and Juliet, and cry-muffling pillow, Rumple's doll, overcoat, and strength, and The Timeline. My spreadsheet: https://drive.google.com/file/d/0B6r8CySCCWd9R0RUNm4xR3RhMEU/view?usp=sharing