:( Ughhhhh...having trouble

I'm glad you're going to be able to help Jasper. :)

You sound like you really care about him, and are responsible enough to take matters into you own hands. I know what it can be like when your parents don't listen. Good luck! ^_^

my friends belgin malios cross would jump on people at the door, so kyla got in the habit of placing the halti and a short lead on her when some one knocked (there was a note on the door explaining that dog training was in progress, so be patient with the door opening). when the visitor knocked, freya would run to the door baying like a hell hound, kyla would take the short lead in her hand and have freya sit before kyla would open the door to the visitor. if freya didn't jump, the visitor would give her a treat(a puppy cookie, really small, just a taste really). after a few minutes kyla would remove the halti, lavish praise and so it went. freya still bays like she's coming through the door to rip out your throat, but she only sits now.
and the suggestion about the whole family using the same word for the same command is dead on right. good luck, i respect your plea for help, you're brave in asking for it.

Thanks joycenalex:D I may give that a try!

.::. Updates .::.

Okay well I also posted my training problems, on a different forum, an all boxer forum, and someone on there found me a clicker trainer right around here, a 10-15 min drive!!

Its $140.00 for 7 weeks, then for the second clicker training course its $120.00 for 6 weeks, and theres also a puppy class thats $149.00 BUT it includes a puppy kit, that to BUY from the trainers shop is $49.00 so really its a cheap class, with a 50 dollar kit!

Should I do the puppy thing first? or go right to clicker?

Go to the library and get yourself a book on dog training.

Take him for a walk every day, and work on training then. Cold or not, he needs his exercise, and it will help both of you.

Make it a routine: when you get home rom school, for example, after you've come in, greeted him and the humans, and gotten all your stuff put down, snap on the leash and take him for a walk! It doesn't have to be for miles, just make it a pleasant time every day. When it's really cold, walk faster, it'll keep you warmer, and him, too.

Take him to parks, and make him sit when you get near friendly-looking people. Most people who like dogs will cooperate if you ask them not to pet him until he's sitting - explain you are training him. With really little kids, if he gets extra wiggly (like every Boxer I've ever known, they've al looooooved kids) either make him sit and hold him between your knees, or, once you've trained him to lie down, have him do that.

But tomorrow, go to the library and get and read a dog training book. It's free, so no one can object, right? Hey, and once you've got him trained to walk politely on a leash, maybe you can walk other people's dogs for money, once they see his stellar example!

Call your vet or local Humane Society, and ask about low-cost classes.

There's no "easy fix" but with effeort and consitency, you and he can become a great team, and everyone will be happier for it. Right now he's probably bored and confused. You working with him, and training him will help both those situations!