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reporter: drew took over his dad denny s route when denny retired last july. denny helmer said he is proud to see his son pick up where he left off. i actually trained him to be my sub, when he first started. he did it a few times. he said this is cool. a neat job. reporter: denny knows how his son feels, because denny took over the same route from his dad dale, when dale retired after 40 years. and dale took over the route from his dad, charles helmer, when charles retired after 43 years. in fact, a helmer has delivered the mail in avilla, indiana, nonstop for 110 years. it s kind of a neat feeling. my dad did it. grandfather did it. now my son is basically doing the same route. makes you feel warm inside, you know. reporter: do you ever when you are here feel your dad or grandfather or your great grandfather looking down at you and making sure kind of funny. i think about it on the route. ....