Tumbleweed was taken in by Ghost as a pup, after she lost her own first dog-pup to a coyote, she has encouraged Lugh to accept him as his own, but despite Tumbleweed's best efforts their relationship remains strained.
The handsome young wolf has no such issues with the rest of the pack, who he wins over easily with his charm and good looks. But he would do well not to forget his place in the pack, as his charm can stray into arrogance at times, earning him a punishment from his elders.