Centuries before, he heard of the many women and children that disappeared, and his sister, Elisabeta, was among them. However, he didn't find a trace of her, coming to the assumption that she had been killed. Luckily, it is revealed in Dark Legacy that Sergey, one of the Malinov Brothers, had actually kidnapped her and kept her prisoner for centuries. Everyone agrees that after she has healed, Traian will be contacted to tell him the good news.
Until Vadim is destroyed, he will choose to stay away from Mikhail and as many of his people as possible to keep them safe. Though, there are exceptions, such as the party in Dark Celebration, where there was a great many hunters to protect the prince. With the ancient hunters around her, fans can assume that Elisabeta will be another exception.