Before We Leave by Mari Collier
BEFORE WE LEAVE continues the saga of a Thalian-Justine mutant from the planet Thalia. While stranded on Earth, he is using the name MacDonald. He has the spaceship to return to his planet and complete his mother’s revenge on the Justines. He needs to gather a force to leave with him, but first he must raise his Earth daughter. His adopted son, Lorenz, a Justine-Earth mutant, is vital for this task of conquering the Justines. Lorenz refuses to leave as long as his wife lives and their children need him. MacDonald needs to convince others to go with them. Before they leave, the Earth mutant offspring experience elopements, Comanche and outlaw raids, hangings, blizzards, madness, quarrels within the family, and a FBI investigation. The remaining family mutants are trained to staff the MacDonald Corporation and carry on their family traditions.
The author has rated this book PG-13 (questionable content for children under 13).