Speck Mellencamp's great grandparents:

Speck Mellencamp's great grandfather was Joseph Lowe Speck Mellencamp's great grandmother was Bessie Lowe

Speck Mellencamp's step-grandparents:

Speck Mellencamp's step-grandfather is Roger Penske Speck Mellencamp's step-grandmother is Kathy Penske

Speck Mellencamp's former step-grandparents:

Speck Mellencamp's former step-grandmother is Lisa Penske

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