Sweetie, you have a lot going on at your house and in your life. I know you feel like you'd like some small, cuddly puppy to help you get through the rough times but a chi is as hard to train as Budee was (maybe harder). What will happen when Bam pees in the house? Will your dad want to get rid of him too? It's not fair to bring another dog into such a chaotic situation. Think how heartbroken you'd feel if you ended up having to sell Bam in a few months.
I feel really bad for you and I hope you find someone to talk to about things in general. But I will feel even worse if Bam Bam becomes a victim in all of this.