22 The scribes who had come down from Jerusalem kept repeating, “He has Beelzebul,” and, “He drives out demons by the ruler of demons.”
23 So Jesus called them together and began to speak to them in parables. ...
31 Then his mother and his brothers arrived. Milling around outside, they sent for him, continuously summoning him. 32 A crowd was sitting around him. They told him, “Look! Your mother and your brothers are outside asking for you.” 33 He answered them, “Who are my mother and my brothers?” 34 Then looking at the people sitting around him, he said, “Here are my mother and my brothers! 35 Whoever does the will of God is my brother and sister and mother.”
Mark 3:20 and following ...
Douay-Rheims
[21] And when his friends had heard of it, they went out to lay hold on him. For they said: He is become mad.
[31] And his mother and his brethren came; and standing without, sent unto him, calling him.
King James:
21 And when his friends heard of it, they went out to lay hold on him: for they said, He is beside himself.
31 There came then his brethren and his mother, and, standing without, sent unto him, calling him
So the people who thought He was mad may not have even been family at all, but they were definitely not His mother and brothers, who arrived 10 verses later even in your translation.
So we still don’t know why His mother and brothers were there.
And again:
35 Whoever does the will of God is my brother and sister and mother. Jesus Himself uses these words to describe people who are NOT his brothers or sisters or mother, so they cannot always be taken literally.
Love,
O2