If he didnt ask for your help, dont volunteer to do anything which includes helping with kids. Behave as if you dont know anything about it. Be calm and happy. Step back. Let him do it by himself if he dont want to communicate with you. Looks to me like an ongoing pattern based on your posts. So, dont give the reaction he is looking for. Be firm, dont encourage indirect communication. He is doing this again because you always take the bait.