They dont sound too bad to me, they are trying to get them to work or even go back to school.
Your daughter was half the reason they had a one night stand so you cant just hate him and not her it really dont make sense.
At least she is in contact with you via text that gives you somthing to build on.
I would keep quiet about any nasty feelings you have for the mum dad and boyfriend to her as that will just push her further away.
I would also try to tone down my anger as that really isnt helping anyone.