"milk-sibling" meaning in English

{
  "forms": [
    {
      "form": "milk-siblings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "milk-sibling (plural milk-siblings)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "milk sibling"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2007, William Cummings, A Chain of Kings: The Makassarese Chronicles of Gowa and Talloq, page 38",
          "text": "He died cut down on board ship, on the north side of Agangnionjoq, seawards of Lipukasiq, during harvest in Maros, on the third night of the month, cut down by his milk-sibling.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative spelling of milk sibling"
      ],
      "id": "en-milk-sibling-en-noun-XJTHeCjf",
      "links": [
        [
          "milk sibling",
          "milk sibling#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "milk-sibling"
}

{
  "forms": [
    {
      "form": "milk-siblings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "milk-sibling (plural milk-siblings)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "milk sibling"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2007, William Cummings, A Chain of Kings: The Makassarese Chronicles of Gowa and Talloq, page 38",
          "text": "He died cut down on board ship, on the north side of Agangnionjoq, seawards of Lipukasiq, during harvest in Maros, on the third night of the month, cut down by his milk-sibling.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative spelling of milk sibling"
      ],
      "links": [
        [
          "milk sibling",
          "milk sibling#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "milk-sibling"
}