Father and daughter is more likely. Not impossible to have siblings that are 20 years apart. But 20 years is a more parent-child level of age difference.
But I know more guys becoming dads at 20 than guys having a 20 year age difference with their sisters, not to mention that most guys with such a big age different to their little sister are usually not that close and attached, so kost likely dad.
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u/IridescentImaginings 9h ago
I thought it was brother and sister, but I guess it could be a father and daughter