I remember Matt holding some of Jeff's dog's collar but I'm not sure if Matt had confessed to burning Jeff's house down. It's just a storyline but in real life Matt would never do something like this to Jeff. The fire started by faulty electrical wiring and it did kill Jeff's dog Jack. Jeff began to build a new home in the same area. Love you Matt and Jeff.
In real life, no they are brothers and love each other. For show, yes he did.
Yes and killed his dog