Mark 13:12

12 Men will hand over their own brothers to be put to death, and fathers will do the same to their children. Children will turn against their parents and have them put to death.

Mark 13:12 Meaning and Commentary

Mark 13:12

Now the brother shall betray the brother to death
Signifying, that such should be the rage of men, particularly the Jews, against Christ and his Gospel, that those that were in the nearest relation, were of the same flesh and blood, children of the same parents, should betray and deliver up each other into the hands of the civil magistrate, in order to be put to death:

and the father the son; and children shall rise up against their
parents, and shall cause them to be put to death;
things unnatural and shocking; (See Gill on Matthew 10:21).

Mark 13:12 In-Context

10 But before the end comes, the gospel must be preached to all peoples.

11 And when you are arrested and taken to court, do not worry ahead of time about what you are going to say; when the time comes, say whatever is then given to you. For the words you speak will not be yours; they will come from the Holy Spirit.

12 Men will hand over their own brothers to be put to death, and fathers will do the same to their children. Children will turn against their parents and have them put to death.

13 Everyone will hate you because of me. But whoever holds out to the end will be saved.

14 "You will see "The Awful Horror' standing in the place where he should not be." (Note to the reader: understand what this means!) "Then those who are in Judea must run away to the hills.