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I think that this is grandfather because after he quit his job as a chef,he still continued to go there and sit at the bar,eating and also chatting with customers

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I think this is probably Grandfather as he supported the Nazis and might have perhaps drunk beer as he often came home late when we worked.

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I think this isn't Grandfather as he is too old to be talking very loudly towards Grandmother.

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I think this isn't Grandfather as grandfather was a chef but Photo C matches his behaviour the most.