I'm not sure specifically which 'mom story' about John Krasinski you are referring to. He's been quite private about his family life in some aspects. But we know his family has influenced his values and career in some way.
There isn't a lot of information out there that is specifically labeled as a 'John Krasinski mom story'. But it's possible that his mom was a source of support during his early days in the entertainment industry. Maybe she was the one who drove him to auditions or gave him the confidence to keep going when he faced rejections. We can assume that his family environment, with his mom as a part of it, contributed to his overall character development which is evident in his on - screen presence.
Well, there isn't a really well - known single 'mom story' for John Krasinski that's super public. However, like many actors, his family background, including his relationship with his mom, may have played a part in shaping his down - to - earth and likable personality that comes across in his work. Maybe his mom encouraged his creativity from a young age, which led him to pursue acting and later directing.