Elusive Kinsman

KINSMAN
Alas, my elusive clansman, You've led me quite a chase. I thought that I'd found your courthouse, But a fire'd destroyed the place.
You constantly kept your bags packed Although you had no fame, And for some inexplicable reason You twice have changed your name.
You never have owed to any man; I've found no nary a bill. You fathered eleven children But never left a will.
They say our name's from Europe, Crossed the ocean on a ship. They either lost the name list, or you, Dad, gave them the slip.
Am I the only one looking? Other searchers I can't find. I ask, was John your father's name, as I go out of my mind.
They said you had a headstone In a specific shady plot. I've been there now a dozen times; I can't even fine the lot.
You sent ne'er a single letter And no-one has found your Bible. I'd gladly name you our black sheep If someone had sued you for liable.
You married your first wife, Mary, Whose last name, of course, is "Unknown". Your following wives were all Sarahs; The first one just set the tone.
You've cost me uncountable hours, I travel and search the 'net. You want me the quest to abandon But I haven't given up yet.
For somewhere you slipped up, Granddad, Yes, somewhere you left a track. And, if I don't find you this year, Why, next year I'll be back!