Without answering your question about mutar or not mutar lets just use some common sense.
Do YOU consider this guy to be honest and trustworthy? Do you think he is someone you can trust to represent you? Why did he wait till now to let this out? Were you planning to vote for him or for his name because you have loyalties to his father? Do you really know his agenda and what he stands for or does he flip according to who is frying him with the best oil and spices?