"-caay" meaning in Ahtna

{
  "etymology_templates": [
    {
      "args": {
        "1": "aht",
        "2": "ath-pro",
        "3": "*-kʸa̓ˑyə"
      },
      "expansion": "Proto-Athabaskan *-kʸa̓ˑyə",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Athabaskan *-kʸa̓ˑyə.",
  "head_templates": [
    {
      "args": {
        "1": "aht",
        "2": "noun"
      },
      "expansion": "-caay",
      "name": "head"
    }
  ],
  "lang": "Ahtna",
  "lang_code": "aht",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ahtna entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "aht",
          "name": "Family members",
          "orig": "aht:Family members",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "woman's grandchild"
      ],
      "id": "en--caay-aht-noun-49kaABtP",
      "links": [
        [
          "woman",
          "woman"
        ],
        [
          "grandchild",
          "grandchild"
        ]
      ],
      "related": [
        {
          "word": "-tsuuye"
        }
      ]
    }
  ],
  "word": "-caay"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "aht",
        "2": "ath-pro",
        "3": "*-kʸa̓ˑyə"
      },
      "expansion": "Proto-Athabaskan *-kʸa̓ˑyə",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Athabaskan *-kʸa̓ˑyə.",
  "head_templates": [
    {
      "args": {
        "1": "aht",
        "2": "noun"
      },
      "expansion": "-caay",
      "name": "head"
    }
  ],
  "lang": "Ahtna",
  "lang_code": "aht",
  "pos": "noun",
  "related": [
    {
      "word": "-tsuuye"
    }
  ],
  "senses": [
    {
      "categories": [
        "Ahtna entries with incorrect language header",
        "Ahtna lemmas",
        "Ahtna nouns",
        "Ahtna terms derived from Proto-Athabaskan",
        "Ahtna terms inherited from Proto-Athabaskan",
        "Pages with 1 entry",
        "Pages with entries",
        "aht:Family members"
      ],
      "glosses": [
        "woman's grandchild"
      ],
      "links": [
        [
          "woman",
          "woman"
        ],
        [
          "grandchild",
          "grandchild"
        ]
      ]
    }
  ],
  "word": "-caay"
}