Parenthood is questionable for more than one member of the Walker family, as Justin keeps a closely guarded secret about the true paternal identity of one of his siblings and Scotty makes a shocking discovery that will bring a new life into the Walker family fold.
Elenco: Dave Annable , Calista Flockhart , Ron Rifkin , Patricia Wettig , Sally Field , Rachel Griffiths , Luke MacFarlane , Gilles Marini , Matthew Rhys , Rob Lowe , Emily VanCamp , Sarah Jane Morris , John Pyper-Ferguson , Gilles Marini , Beau Bridges , Matthew Rhys , Robert Kazinsky .