It appears that Mr. Watson was the sacrificial harvest victim stoned last year, because the "Watson boy" steps up to draw this year for his mother and himself. He is described as nervous, and he keeps ducking his head, as if he does not want to make eye contact with the other villagers. He is also praised by them as a "good fellow" and a "man" stepping up to the plate to spare his mother having to draw.
What is interesting is that the text—and the villagers—never acknowledge that his father was stoned to death. As with other parts of the ritual, the stoning, though it continues, is less and less central to people's lives. The box that holds the lottery tickets is splintering and nobody wants to repair it. The ritual grows shorter and shorter as people grow more uncomfortable with it. The villagers must know that they last year they stoned to death the Watson boy's father, but they leave it unspoken and paper over it with weak praises of the son. It is as if they are ashamed to remember. We see a tradition that has long outlived any "usefulness" still clung to in a way that suggest guilt, denial, and discomfort.