Have name changed for this. DS (4) finished school yesterday for the summer. DH and I work full time so DS and DD (2) went to in laws today. DD seemed to be a bit over excited that DS was off school and started pinching and hitting DS to wind him up. DS then came home later that day saying MIL had told him to hit DD back! DH (who had picked them up) confirmed that she had said this - it wasn't DS making it up. AIBU to think that's not how she should have dealt with the situation? I dont really understand why she thought that was an appropriate resolution. I don't want DS and DD growing up to think they should hit people.