{
  "$defs": {
    "GrandfatherType": {
      "additionalProperties": false,
      "properties": {
        "family_name": {
          "type": "string"
        },
        "ip_addr": {
          "format": "ipv4",
          "type": "string"
        }
      },
      "required": [
        "family_name",
        "ip_addr"
      ],
      "type": "object"
    }
  },
  "$id": "https://github.com/invopop/jsonschema/grandfather-type",
  "$ref": "#/$defs/GrandfatherType",
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}