function spouseRecord(){
  var query = app.models.Dependent.newQuery();
  query.filters.Relationship._equals = "Spouse";
  var spouse = query.run();

  var payload = {
    SpouseName: spouse[0].LastName + " " + spouse[0].FirstName + " " + spouse[0].MidName,
    SpouseSSN: spouse[0].SSN,
    SpouseDateofBirth: spouse[0].BirthDate.toLocaleDateString(),
    SpouseSex: spouse[0].Sex,
  };
  return payload;
}

var payload = google.script.run.withSuccessHandler().spouseRecord();