How to help DSC?

[Awaanbileyirheid]

Ok, I'm a step mum. No, I wasn't the OW. I'm not evil and I treat my DSC as fairly as my own DC. Hopefully thats sorted out the first few posters!
I'm going to be vague here but the crux of this is my teen DSC mum doesn't give a shit about them and its breaking their heart.
Mum has always been emotionally distant, DH had 50/50 since dsc was 2. Always supportive, don;t slag mum off. Just doing our best and navigating a blended family. We're not perfect but we put kids first.
DSC chose to live with us last year as mum boyfriend picking on them and mum backing boyfriend not DSC. Mum is functioning alcoholic, out every weekend and not present much so that contributed too.
Tried meetings and encouraging contact/resolution but mum not willing to listen or acknowledge DSC's concerns. DSC gutted. Contact is fizzling out as DSC must go to mum, mum refuses to meet DSC anywhere else but at her home. Theres a history of DSC being locked in house while mum has a go at them so that has also stopped.
Due to abuse whilst with mum, DSC is in counselling which is helping.
DSC is breaking their heart as mum out on piss again and DSC wants mum to care. Asking why isn;t mum at our door or calling them? Why doesn;t mum care enough to try?
I genuinely don't know how to help this poor kid. Has anyone any advice?
DH is great and I love DSC but its not enough.
We can't force mum to parent and talking to her has failed.
I'm fresh out of ideas! Any ideas or experience welcome!

Heartbreaking. I think ask if she wants to talk to a counsellor about it? Poor kid.

You can't change the behaviour of the mum. I agree that therapy for the DSC might be the way forward.

Thanks. DSC is in counselling already which is helping.
I just had a mad hope I could do more to help them.

I'm wondering if Al Anon might be helpful. There are teen specific groups in some places and family groups. She might benefit from attending a young/child carer group too. It's very likely living with an alcoholic parent that times she's had to take on the carer role or been told things adults shouldn't share with children. There's a section on her for support around alcohol issues, they might have some more target advice.

It is very hard as a child to understand that your parents behaviour is about who they are not about you and your own worth. We measure ourselves against our parents love for us. We're taught mothers are always there. I know growing up I found that especially hard. I knew a few kids whose father has walked out, I didn't know anyone else whose mother had. MH issues not alcohol, though my Dad who's a good guy self medicated with alcohol for a few years which wasn't exactly conducive to feeling safe and secure. My mother leaving impacted my self esteem for a long time. As an adult I can understand that she left because of who she was, but as a child and a teen it felt like I was to blame and not good enough. It's a lot for a child to deal with.

There's a section on her for support around alcohol issues, they might have some more target advice.
On here not on her.

@EliflurtleTripanInfinite I'm sorry you went through this too, dsc is starting to question their self worth, it is a lot to deal with. overwhelmingly so.
DSC school have put them in touch with alcohol support worker as yes DSC was carer for siblings at mums and has heard things from mum no child should ever hear.
Thanks, I'll have a look on here for more support.
Can I ask as someone who has gone through this, is there anything someone could have done to help you?

You sound lovely OP x