'Tis an interesting one alright and I'm pretty sure it was explained a while back on here, but I can't find the exact post right now. Could it be this? Kane's father is Dublin-born, and presumably not a Ferdinand, so I'd guess Kane's mother (surnamed Ferdinand) is a sister of the father of Rio and Anton. Both Ferdinand's just happened to get into relationships with Irish partners and Kane took his mother's surname as his parents weren't married. Kane must be close to his father too though if he feels some affinity with Ireland. Does that add up? Without sounding too voyeuristic...
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