- You may be looking for his great-great-great-great-grandson.
Conall Lethbridge-Stewart was the father of Hamish Lethbridge-Stewart and the grandfather of Alistair Conall Hamish Lethbridge-Stewart and Archibald Hamish Lethbridge-Stewart.
Alistair senior could detect traces of his grandfather in his grandson, Alistair Jnr. (PROSE: The Note)
His great-great-great-great-grandson born in 1990 would also be named Conall Lethbridge-Stewart. (PROSE: The Enfolded Time)