Mark 3

Chapter 3 opens with Jesus in the synagogue, Remember the Synagogue is where the Jews go for "church". Throughout Scripture we see teaching taking place in the Synagogue. When we get into Paul's ministry he would always go to the Synagogue first then out to the rest of the people. Watch for this.

verses11- 12- Here we see again in Mark, People realizing Jesus Authority as the Son of God and Jesus asking them to keep it quiet. This is the opposite of what you would expect a Messiah to do. Jesus did a lot of things that did not line up with our expectations of Him. Look for more examples...

BOANERGES!!!!!!!!!!!!!!!!!

Verses 31ff- Harsh Words to Mother and Brothers? or Jesus using a Teachable Moment? or Something else???

It is possible that here Jesus family (at the beginning of His ministry) had come to talk Him out of what he was saying (remember how he talked to Peter in the last chapter when Peter did the same) If this was the case then His words don't seem as harsh. If they were against His ministry and thought Jesus out of His mind then Jesus needed the harsh words. (see Matthew 12:46-50 & Luke 8:19-21)
Also in Jewish custom it would have been expected that Jesus stop his teaching immediately and come out to see them. The New Bible Commentary says, "Remeber that, as yet, his brothers did not believe in him, and even Mary cannot have completely understood him, or she would not have come on this trip..." This may seem harsh, but then again it does bring "great comfort to some of us who were rejected by home and family when we became Christians, but who found in this 'family of Christ' love and support" pg 957

It is good to remember that even in our families Jesus must come first! This is not to say we should reject our family, but Jesus must be first.