tree.js

var data = {
  "id": "3",
  "create_at": "2016-10-15 05:28:10",
  "account": {
    "username": "mgrantbt"
  },
  "ticket": {
    "status_id": "2"
  },
  "amount": {
    "name": "Equaline",
    "number": "13"
  },
  "childs": [
    {
      "ancestor": "3",
      "descendant": "6",
      "username": "lbennettmk"
    },
    {
      "ancestor": "3",
      "descendant": "7",
      "username": "gricehj"
    },
    {
      "ancestor": "6",
      "descendant": "12",
      "username": "rcarroll8y"
    },
    {
      "ancestor": "6",
      "descendant": "1002",
      "username": "jdunn4t"
    },
    {
      "ancestor": "7",
      "descendant": "1003",
      "username": "jdunn4t"
    }
  ]
};

var nodes = [],
    relations = [];

for(child in data.childs){
  nodes.push({
    id: data.childs[child].ancestor,
    name: data.childs[child].usernaeme
  });

  relations.push({
    parent: data.childs[child].ancestor,
    child: data.childs[child].descendant
  });
}