Met a guy a little less than a year ago about classic cars and we became friends. I have been to his home several times and met his family. Super great people no doubt. He has three sons and the oldest is 20 years old. Tall guy but only weighs about 170 pounds. I have watched this young son jokingly wrestle with his father who is 55 and much smaller than his tall son. Not a big deal but the father does nothing but take it. Problem is that this guy has "jokingly" challenged me twice. He hasn't touched me yet but he is testing me. I am not good at dealing with people that touch me. My policy is hands off and I treat others with greater respect. So what should I do? Should I say something to his father? Reason is that if he wants to go I will knock him down without playing around. If that happens I am sure that I will not be invited back which obviously creates a dilemma.