"aux siennes" meaning in Français

{
  "categories": [
    {
      "kind": "other",
      "name": "Pronoms possessifs en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "De l’article défini aux et de siennes."
  ],
  "forms": [
    {
      "form": "au sien",
      "ipas": [
        "\\o sjɛ̃\\"
      ],
      "tags": [
        "singular",
        "masculine"
      ]
    },
    {
      "form": "aux siens",
      "ipas": [
        "\\o sjɛ̃\\"
      ],
      "tags": [
        "plural",
        "masculine"
      ]
    },
    {
      "form": "à la sienne",
      "ipas": [
        "\\a la sjɛn\\"
      ],
      "tags": [
        "singular",
        "feminine"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "pron",
  "pos_title": "Pronom possessif",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Wiktionnaire:Exemples manquants en français",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Possessif de la troisième personne du singulier au féminin pluriel."
      ],
      "id": "fr-aux_siennes-fr-pron-iAMnMlmj"
    }
  ],
  "sounds": [
    {
      "ipa": "\\o sjɛn\\"
    }
  ],
  "tags": [
    "possessive"
  ],
  "word": "aux siennes"
}

{
  "categories": [
    "Pronoms possessifs en français",
    "français"
  ],
  "etymology_texts": [
    "De l’article défini aux et de siennes."
  ],
  "forms": [
    {
      "form": "au sien",
      "ipas": [
        "\\o sjɛ̃\\"
      ],
      "tags": [
        "singular",
        "masculine"
      ]
    },
    {
      "form": "aux siens",
      "ipas": [
        "\\o sjɛ̃\\"
      ],
      "tags": [
        "plural",
        "masculine"
      ]
    },
    {
      "form": "à la sienne",
      "ipas": [
        "\\a la sjɛn\\"
      ],
      "tags": [
        "singular",
        "feminine"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "pron",
  "pos_title": "Pronom possessif",
  "senses": [
    {
      "categories": [
        "Wiktionnaire:Exemples manquants en français"
      ],
      "glosses": [
        "Possessif de la troisième personne du singulier au féminin pluriel."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\o sjɛn\\"
    }
  ],
  "tags": [
    "possessive"
  ],
  "word": "aux siennes"
}