Ok well if it's P class (Business Lite), then both OWE will get Al Mourjan, it's hit and miss whether your adult kids will be permitted or not. If they're not and you all wish to be in a lounge together, then it'll be the Silver Lounge, which is definitely inferior but better than most third party contract/Priority Pass lounges. However, matters become a lot easier if it's a non-Business Lite fare as then you'll all be permitted into Al Mourjan, no questions asked.