回复：老大把我要气死了--帮帮忙

Your son seems to be a very sweet boy. If he "说什么，我不喜欢他，老是说他，我就只对妹妹好，不公平，他不喜欢自己，想要去死之类的话。" again, maybe you just hold him and tell him that "you love him, if anything happens to him, you would not want to live"? 

Sorry, no experience.  Only one child and he knows I love him most. 6 years old can still use lots of hugs and kisses ;-)