Paperlantern, without starting a fight and bickering about some of the issues you raise, I would like to say that my DH also can not wait for both of them to leave home and start their own lives. He left his EX 9 years ago due to her controlling behaviour towards him which was due to her showing symptoms of bipolar and personality disorder, none of this was diagnosed at the time, then became a diagnosis of PTSD (for what we still have no idea).
DH loves his kids and has always been a good father, but he is not hung up on being the perfect father. He has minimal contact with his eldest DD, purely because he is not a doting Dad who has to call her every day or so.
He became a father at a very young age, and to be honest, enjoyed his freedom when he left the marital home 9 years ago. He will always care for them, but I do not think he will have a really close relationship with the 2 youngest when they leave home. Thats just his way.
He saw it as his duty to house the 2 Teens due to the fact that they were expressing concerns about having to care for their mother. He would rather have left them where they were, if a competent adult was in place. They did not go through an extended care process - Police got Social Workers involved when EXW was admitted to hospital after a 2nd suicide attempt and said that she could not look after the children anymore, when infact, they were looking after her.
We attended 2 Family Conference Sessions whereby it became clear that EXW's welfare was the main concern of EXW's Mother, rather than her own Grandchildren. At that point, we had to make the decision to rehome them. Social Workers were only bothered about the 15 year old DSS, not the 17 year old DSD.
When we announced this at the Family Conference review meeting, EXW's Church "carer" said that it would be very hard for me to adjust, and I just bit my tongue, saying yes, not realising the affect it would have on me at all. I am a first line carer because of my husband. He sees it as a "duty" to care for his nearly adult children, not an act of love, believe me.
So, put yourself in my shoes: nearly 50, never had kids (my dogs are my babies), did not want to become a mother at 48, and if I had wanted to, did not want to have to give birth to 2 nearly adults, who grunt and strop and roll their eyes when things don't go their way. Perhaps "Hate" is a bad word to use, I admit that, but I now realise belatedly, that I just do not want them FULLTIME, and have absolutely no choice until they go to Uni, or whatever they decide to do.
My fault, I agreed to take them in, as I wanted to support my husband, but we didn't really have a choice at the time. We then had to fight for 6 months to annul the maintenance contract via mediation and solicitors, as EXW felt that it was her right to continue to receive £1K per month to live on her own, as she does not work and still lives in the 4 bed marital home. We won that battle eventually, but the stress has been considerable, and has had health implications for me.
There, so stop judging me as the WSM, and understand, that I can not just press a switch that says that I should love my life and become a doting Step Mother, when infact this year has felt like hell on earth.