Of the two children, the elder is Sun Wufan and the younger is Sun Wutian. But these are all things that happened in the sequel of Dragon Ball.
Wukong's growth process is very similar to that of his father the Monkey King. He was trained by Wukong and Piccolo since he was a child and suffered a lot. Wu Tian is very happy. He was born in a very peaceful era, and his training methods are very mature. He and Torankusu are best friends.
In the sequel to Dragon Ball, the role of Sun Wutian is not important, and there is no time to turn the tide. In my opinion, the existence of Sun Wutian has the following two meanings:
First, it reflects the progress of the times. As we all know, when Dragon Ball was first published, the technology of the earth was still relatively backward. At this time, both the external environment and the overall technology look a little old. The comedian here is a white peach with long braids.
When we arrived in Sun Wutian, great changes had taken place in the whole society. There are not only luxury cruise ships here, but also many delicious foods and interesting things.
I think comparing the growth experiences of Wu Tian and Wu Fan, we can see that the times are constantly changing and Wu Tian is also a happy generation.
Second, the continuation of the Monkey King Although Goku already has a son like Goku, Goku has been studying with Piccolo since childhood, so there is a big gap between Goku and Goku in personality and dealing with people.
Wu Tian is much more naughty and looks more like Wukong when he was a child. Plus Vegeta's son Torankusu was born, like Wu Tian and Torankusu, and Gogeta continued.
The above is my personal opinion, the significance of Sun Wutian's existence; I don't know what the meaning of enlightened existence is in your opinion.