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Donald Davis, 54, of Reading, who will run the Boston Marathon route Sunday a week early to raise money for DonateLife and promote organ and tissue donation, gets ready for a short run at the Marshall Middle School track with his nephew, who will run with him forwards. (SUN/Julia Malakie)

Donald Davis, 54, of Reading, right, will run the Boston Marathon route Sunday a week early to raise money for DonateLife and promote organ and tissue donation. His nephew Bryon Patten, 34, of Woburn, left, will run with him forwards to keep him on course. Both are originally from Billerica. They are doing a run at the Marshall Middle School track to work on their pace. (SUN/Julia Malakie)

Donald Davis, 54, of Reading, right, will run the Boston Marathon route Sunday a week early to raise money for DonateLife and promote organ and tissue donation. His nephew Bryon Patten, 34, of Woburn, left, will run with him forwards to keep him on course. Both are originally from Billerica. They are doing a run at the Marshall Middle School track to work on their pace. (SUN/Julia Malakie)

Donald Davis, 54, of Reading, will run the Boston Marathon route Sunday a week early to raise money for DonateLife and promote organ and tissue donation. He's originally from Billerica. (SUN/Julia Malakie)

Donald Davis, 54, of Reading, right, will run the Boston Marathon route Sunday a week early to raise money for DonateLife and promote organ and tissue donation. His nephew Bryon Patten, 34, of Woburn, left, will run with him forwards to keep him on course. Both are originally from Billerica. They stretch after a workout at the Marshall Middle School track. (SUN/Julia Malakie)