Arbitration is confidential. Your friend should not divulge any information relating to the award made in their case. You cannot therefore, refer the arbitrator to your friend's case or any award that was given.
You should have provided the travel company with an opportunity to investigate and comment on all of your evidence. Therefore you should not submit new evidence as part of your claim through the arbitration process.
Many tour operators offer family-specific packages with great facilities to make your holiday more relaxing, including services such as babysitting and childcare. It’s worth finding out what services are available in your resort, helping you to plan ahead.