{"family": {"id":1, "name": "myFamily","members": [{"userId":15, "lasName": "COLINET", "firstName":"Steve","latitude":48.290762, "longitude":4.070 },{"userId":18,"lasName":"BERTHIER","firstName":"Renaud","latitude":48.290755, "longitude":4.071 }]}}

func getMembers(username:String, password:String){
    var members:NSDictionary = [:]
    let parameters: Parameters=[
        "action":"getPosition",
        "username":"(username)",
        "password":"(password)"
    ]
    Alamofire.request(login_url, method: .post, parameters: parameters).responseJSON{
        response in

        switch response.result {
        case .success(let data):
            guard let json = data as? [String : AnyObject] else { return }
            members = json["family"]!["members"] as! NSDictionary
            print(members[0] as Any)
        case .failure(let error):
            print(error)
        }
    }
}