Read Luke 5:1-11 with your family.
In the other Gospels, once Jesus is baptized and spends time in the desert, he immediately goes to ask the people he chose to be disciples. In Luke we already have Jesus hard at work before asking anyone to travel with him. This story is the first time we meet Peter (named Simon in this story), James and John in the Gospel of Luke.
According to Luke, they were all working together and catching nothing with their fishing nets, so Jesus tells them to try one more time, and their nets are full.
We don’t know if Peter knew of Jesus from stories of his travelling around or not, but he knew Jesus was a great man. Calling Jesus “Lord” did not mean that Peter understood who Jesus was fully, just that he respected Jesus as being a very important man.
Important enough that the three men, Peter, James and John left everything behind and started to follow Jesus.