We have seen that Nobita and his ancestors are weaker than Gian, Suneo and their ancestors. Nobita's descendants are also supposed to be having the same personality. As we have seen in the episode All Alone In The City Of The Future that Gian's and Suneo's grandchildren insulted Sewashi as he spent his holidays just by playing the video game while they spent their holidays on Mars and Sun. That means that Sewashi is also a weak kid. But in the episode Nobita's Bride, we saw that Suneo's wife complained to Shizuka Minamoto about Nobisuke as he bullies her son. Nobisuke should have been weaker than Suneo's or Gian's sons. So how can Nobisuke bully Suneo's son?