I'm posting in case anyone has any advice. Since separation from his ex about 3 years ago, my DP has had 50/50 arrangement with his DC (aged 9 and 6) although he does all of the 'admin' stuff like doctors, dentist, parents evening, form-filling, applying for passports etc. Mum has a history of impulsive behaviour, debts, dramatic falling outs with friends, not being able to hold down a job etc. She moved straight in with a new DP after separation and DC live there half the time. There don't seem to be any huge issues there as the DC seem to get on with him (tho they don't mention him often) and he probably has a stabling influence, although to me it seemed very soon - we waited a lot longer and did gradual intros and we still don't live together and stress that it's their house, I am visiting etc.
Anyway, over the past few months, there have been the beginnings of PA visible but only with regard to eldest DC. She has a tendency to favour the eldest and ignore the youngest. She babies him and encourages him to be very emotionally clingy (entirely inappropriate for his age). It's now graduated to her telling him to say that he wants to see her every day and can't cope without her. As in, she says this openly to him at drop-offs and that his dad is keeping her from him and that he (the child) needs to speak out about it. He then repeats it, although it sounds rehearsed rather than truly heartfelt. It's quite heartbreaking and takes a lot of work for my DP to calm him down (after which he is totally fine). Other DC seems happy.
Was wondering if anyone has any advice or had been in similar situation and what you did to help it? My DP and I never talk badly about Mum, only briefly correcting blatant untruths (like when she told the child that my DP threw her out and made her homeless, which is utter rubbish as he gave her a large lump sum for a deposit despite never being married and having no obligation to do so and she cheated on him). We don't want court if possible. I don't get directly involved as I don't feel it's my place but my DP makes clear his DC can always talk to him and tries to create a safe space etc.
Thank you.