I know how you feel. Yasin has taken to pushing his brother lately too
I'm a bit at my wits end because I make him sit down for a while and then say sorry/give his brother a kiss so now he pushes Imran and then gives him a kiss straight away. I didn't stop the pushing - just taught him to kiss and make up at super quick speed
I just keep sitting him down, giving him boring little lectures and telling myself that it will pass.