Buddha’s son, Rāhula, died before the Buddha and his teacher Śariputra. Available sources state that Rāhula’s death is not extensively described in the earliest texts. It is mentioned that he died while traveling psychically through the second Buddhist heaven, known as Trāyastriṃśa, according to Pāli and Chinese sources.
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Despite the limited information, it is understood that Rāhula’s death occurred prior to the deaths of the Buddha and Śariputra. It is important to note that the exact circumstances and details surrounding Rāhula’s death are not provided in these sources.