This is NOT a phase and has the potential to become a very serious problem. Goblin is being very dominant and must be taught not to behave in this way - ever!
As soo as he starts to jump up at you avoid eye contact and do not speak to him at all. Get the whole family to deal with him in the same way. As he prepares to jump up at you raise your knee fast until it is at right angles to your body - do not turn away from him as this encourages the behaviour - if you are walking around, carry on. When he tries to jump again, raise your knee, fast, again. This will give you some space and show him that he is not gaining your attention from his actions. Beware that this behaviour will get worse before it gets better - the dog is thinking ,"It always got me attention before so I'll try harder and it will work again!" Do not give in! Totally ignore him until stops jumping. The trick is as soon as there is a lull in the jumping you must be ready with a very firm,"Sit!" Then give a calm pet and a very calm,"Good boy."
I would suggest you always leave a short line on him in situations when this happens - if he doesn't respond to the sit command you then have some control method without touching him.
Also if he starts to try to bite you, use the line and give him a really good correction - this is no time to play at it - say "No! Sit!" again if he refuses correct him with the line.
I hope this is helpful and if you think the correction bit is a bit over the top just imagine how you will feel with a fully grown dog jumping and biting you! It is not a situation I would want!
Good luck - let us know your progress.