We actually owe the birth of the radio control hobby to Mr. Tesla, who demonstrated a radio controlled model boat in New York City in 1898.
The Good brothers are certainly the fathers of powered RC aircraft.
A very obscure rc glider project in South Africa was evidently the first radio controlled aircraft, created around 1918-1922, if I remember correctly. One of the RC model magazines had an article complete with pictures about this glider project. I have never been able to locate this article again, or find any other info.