You need to stop trying to be friends with your kids
You are the parent here
it doesn't matter if your kids like you or not because you have to do what is important to get them out of this crap
if you have parental custody of them, now is the time to commit your son to the treatment program mentioned by the school counselor
now is the time to stop being manipulated by your daughter
now is the time to pull your parent panties up and get to work
no more wallowing
time to get to work
you have let it go this long
you lost the oppportunity to text with your son when he texted you by repeatedly texting him back and adding sad faces etc...you are an adult for God's sake...you don't beg for your son's responses
step up and be the parent even if they don't like it and even if they get mad