When He had gone a little farther from there, He saw James the son of Zebedee, and John his brother, who also were in the boat mending their nets. And immediately He called them, and they left their father Zebedee in the boat with the hired servants, and went after Him. Mark 1:19-20
With a prosperous and cheerfully-named father, the sons of Zebedee probably saw their future lined out before them until that day. Mending nets may not have been their favorite part of the job, but equipment maintenance must be done or the equipment fails when it's needed most. However, their mending net days were about to go on a long pause. Did they look down the coast and see Jesus call Andrew and Simon? Maybe, but the calling of James and John came next, and they dropped the nets to follow this new rabbi.
We can see from the gospels - and the Revelation (heh, look out below, John!) - the amount that the brothers did not know that day was huge. They left the nest to follow not just any rabbi, but the messiah foretold in a host of prophecies. The brothers would come to believe in Him, while most of their nation would remain hardened of heart and unbelieving. Oh, but the signs they would see on this journey and the words they would hear from the Christ!
Love and joy to you in Christ Jesus our Lord!
Bucky