It seems like you and your family are punishing Mack only halfway. When you verbally reprimand him, do you ever dole out consequences? If not, Mack knows that if he persists enough, he'll get what he wants. In the same sense, even negative reinforcement is positive reinforcement in this situation. Mack wants your BF and so nips and barks at him. BF says No and I would imagine probably started swatting Mack or some similar action. That, in itself, is positive reinforcement for Mack to continue nipping/barking.
Instead of arbitrarily rewarding Mack's behavior, do NOT give any reinforcement whatsoever when he is doing an undesirable behavior.
For nipping, you have two methods:
1. When puppies were young, they learned bite inhibition through each other. Whenever a littermate bit too rough, the pupppy would yelp. The rule was simple: play nice or leave. You can mimic this by yelping "OUCH!" loudly every time Mack bites and if he backs off or sits, praise and treat. And, if desired, you can shove a chew toy in his mouth.
2. Give absolutely no reinforcement when Mack nips. When he nips, stand as still as a tree with your arms crossed. You should even look the other way because staring a dog in the eyes is exciting to them. When he backs off or sits down, praise and treat.
For the barking, ignore it altogether. No reinforcement = no purpose to continue the behavior. Keep in mind, there will be what is known as the "extinction burst". Because Mack has been so successful with his barking, he will continue doing it. Thus, when you try to ignore his barking, he might possibly increase his barking because he thinks you'll give in. Just keep ignoring him and he will stop. Good luck!
ETA: I also wanted to add that now would be an excellent time to start Nothing in Life is Free (NILIF). With this training method, the pack hierarchy is established as you being the alpha and Mack the subservient member. This will help you IMMENSELY as you try to control his behavior:
http://k9deb.com/nilif.htm
http://www.greyhoundlist.org/nothing_is_free.htm
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? Bower also barks at me when he's hungry, thirsty or wanting to play and it's nice that he can tell me when he needs something but when he gets into trouble he likes talking back. So I have read this book called "The Latchkey Dog" and I will be alpha but at this time it seems as if fiance' is alpha. Bower really listens to Tom well but Tom works 12 hour days and isn't home much so Bower gets loud quite often with me. Usually during the day he is fine with me, always wants to cuddle and be by my side BUT when company comes over he acts up something serious. So I often though he was trying to compete for my attention and when I give him total attention he calms down some but not totally. I want to take him to obedience training but don't think I can until I can ensure he won't bark furiously at someone or nip at them. The one thing I don't understand is he LOVES other dogs AND cats but acts like he doesn't like some people. I get scared of his nipping and don't know what to do when he does it. For example the other day I was messing around at him and he jumped up and got my face-he didn't bite down and it didn't leave any marks nor did it hurt. I said "ouch!" and immediately he layed down and hid his face like he was ashamed or apologizing. If he nips like that when he's playing, how can I be sure he won't bite as an adult dog? I love him so much and am willing to do whatever it takes to stop these bad habits-I need to gain control but everything the books tell me to do doesn't work, he just barks back at me. I have tried ignoring, turning my back and even my vet has shown me some restraint methods when he gets crazy mean but its like putting a bandaid on a severed arm it seems. 
Originally Posted by Bronx'sBower
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