Mark 13:12

12 `And brother shall deliver up brother to death, and father child, and children shall rise up against parents, and shall put them 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 and to all the nations it behoveth first that the good news be proclaimed.
11 `And when they may lead you, delivering up, be not anxious beforehand what ye may speak, nor premeditate, but whatever may be given to you in that hour, that speak ye, for it is not ye who are speaking, but the Holy Spirit.
12 `And brother shall deliver up brother to death, and father child, and children shall rise up against parents, and shall put them to death,
13 and ye shall be hated by all because of my name, but he who hath endured to the end -- he shall be saved.
14 `And when ye may see the abomination of the desolation, that was spoken of by Daniel the prophet, standing where it ought not, (whoever is reading let him understand), then those in Judea, let them flee to the mountains;
Young's Literal Translation is in the public domain.