Life's Surprises

S5, E12: The Rafter clan is delighted that Nathan suddenly returns, but his surprise not was poorly timed, it's surpassed by his news: he has a new life in London, which includes a much older wife, widow Saskia, who is expecting his baby. Ben surprises them by announcing he's leaving on his own world tour. Ted informs Donna that a first medical examination suggests he may be suffering from Alzheimer.