Was odette churchill related to Winston churchill?

No. During World War 2, she worked with a British agent in France by the name of Peter Churchill - who wasn't related to Winston Churchill either, but when they were both arrested by the Gestapo, she claimed that she was married to Peter and that he was related to Winston, in the hope that they would get better treatment from the Gestapo. Her ploy didn't work and they were both tortured by the Germans.