I'm not sure if anyone's done it yet so I charted DSP's family tree on ancestry. I couldn't find anything about Fred Burnell except that according an obituary he lived in Alaska at some point, does anyone know anything else about him? He's probably English as Burnell is an English name.
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So, the result is Phil is 1/4 Polish, 1/4 Slovak, 1/4 Italian, 1/4 ???
Edit: Something I just noticed is that Nellie Grabiec birthed Linda quite late for the time at 37 years old. Maybe genetic defects associated with that are why Linda seems so repugnant in Phil's stories?