Entitled Brother Thinks His Kid Is the Exception to a “Child-Free” Wedding Invite
There's nothing worse than someone who thinks that they are the exception to every rule. If anyone has siblings like this or families who enable this type of behaviour then you have my sympathies. This type of behaviour is only possible when the people around them allow it to persist.
Paul sounds like he is a right piece of work and him and his wife, possibly the entire family, are entirely delusional. It is completely out of expectation to think that you would be the only exception for a child-free invitation. Time for a reality check. If there's one thing for certain it's that weddings bring out the family drama.