Luke 5

Matthew records -

"...Jesus, walking by the sea of Galilee, saw two brethren, Simon called Peter, and Andrew his brother, casting a net into the sea: for they were fishers.
19 And he saith unto them, Follow me, and I will make you fishers of men.
20 And they straightway left their nets, and followed him.
21 And going on from thence, he saw other two brethren, James the son of Zebedee, and John his brother, in a ship with Zebedee their father, mending their nets; and he called them.
22 And they immediately left the ship and their father, and followed him." (New Testament | Matthew 4:18 - 22)

Mark seems to record the same event as Jesus -

"...walked by the sea of Galilee, he saw Simon and Andrew his brother casting a net into the sea: for they were fishers.
17 And Jesus said unto them, Come ye after me, and I will make you to become fishers of men.
18 And straightway they forsook their nets, and followed him." (New Testament | Mark 1:16 - 18)

But John writes a little different story of may have been there first meeting with the Savior -

"...the next day after John stood, and two of his disciples;
36 And looking upon Jesus as he walked, he saith, Behold the Lamb of God!
37 And the two disciples heard him speak, and they followed Jesus.
38 Then Jesus turned, and saw them following, and saith unto them, What seek ye? They said unto him, Rabbi, (which is to say, being interpreted, Master,) where dwellest thou?
39 He saith unto them, Come and see. They came and saw where he dwelt, and abode with him that day: for it was about the tenth hour.
40 One of the two which heard John speak, and followed him, was Andrew, Simon Peter's brother.
41 He first findeth his own brother Simon, and saith unto him, We have found the Messias, which is, being interpreted, the Christ.
42 And he brought him to Jesus. And when Jesus beheld him, he said, Thou art Simon the son of Jona..." (New Testament | John 1:35 - 42)

Luke records what seems to be another event as the Savior -

"...saw two ships standing by the lake: but the fishermen were gone out of them, and were washing their nets.
3 And he entered into one of the ships, which was Simon's, and prayed him that he would thrust out a little from the land. And he sat down, and taught the people out of the ship.
4 Now when he had left speaking, he said unto Simon, Launch out into the deep, and let down your nets for a draught.
5 And Simon answering said unto him, Master, we have toiled all the night, and have taken nothing: nevertheless at thy word I will let down the net.
6 And when they had this done, they inclosed a great multitude of fishes: and their net brake.
7 And they beckoned unto their partners, which were in the other ship, that they should come and help them. And they came, and filled both the ships, so that they began to sink.
8 When Simon Peter saw it, he fell down at Jesus' knees, saying, Depart from me; for I am a sinful man, O Lord.
9 For he was astonished, and all that were with him, at the draught of the fishes which they had taken:
10 And so was also James, and John, the sons of Zebedee, which were partners with Simon. And Jesus said unto Simon, Fear not; from henceforth thou shalt catch men.
11 And when they had brought their ships to land, they forsook all, and followed him." (New Testament | Luke 5:2 - 11)

As I have read the records of Matthew and Mark in the past, the impression I received was Peter, James and John immediately "forsook all" or everything in their lives and from that day on followed the Savior. One thing that seemed strange to me was that I would assume Peter, James, and John were probably married and had children. That would seem very irresponsible to "forsake all" from then on.

I am beginning to believe that these brethren did forsake what they were doing to follow the Savior as they were called for a period or a particular mission but then would return after a breif ministry to provide and support their family. I've wondered if with each of these events that the Savior called them each time for short season as He embarked on another particular ministry. Much like in the Church where we are called for a season of service and then released. And after each release another call would typically be extended.