>> reporter: no, none of them are. bill did learn to walk. and son kevin, he's running the boston marathon. you still feel the shrapnel at snaul. >> i do. it doesn't hurt. >> reporter: he explains why this is so important to him in his blog. the name of your blog is footsteps. >> yeah. for us it was to be a concept of footsteps was taking steps forward from where we were and with my dad that's literally walking so those are his footsteps forward. mine is training for the marathon and just kind of coming to grips with everything that happened last year and probably the same for my mom, just recovering from that. >> good girl. very good. we have really tried to work together and individually at our own marathons this year just every day. >> when i think probably for kevin and the others who are running, hopefully it will get to that point in the run where