Wow...... where should I start?

If Savage is left alone outside and not allowed to have much human contact, that will only make things worse. So isolating him to the back garden 24 7 is NOT an option.
Dogs are pack animals and do not do well when forced to live a live of solitude, especially since he just lost the only other member of his pack.

As far as Chloe jumping on Savage, it may just be her way of playing or it may be that she's trying to be the dominate one. My suggestion to you would be to find a local trainer or behaviorist to come to your house and see first hand just what is going on between Savage and Chloe. They are trained professionals and can tell by the dogs body posture exactly why they are doing the things they are doing.

The problem you have with Savage and Jade is sad. Why in the world would a father tell a dog to "go get him" is beyond anything I can understand.
That problem was created by your father 100% and you need to have a trainer intervene asap before something horrible happens. I know you said Jade chased Savage with a pitch fork before, but I'm sure that happened once the growling started, which was started by your father.

I hope something I said helps and I hope your parent's do the right thing and consult a trainer asap.