I will admit, I am furious and could see this coming a mile off. 
DH's ex was sacked from her job a while ago. It was a culmination of lots of things. Shagging the married boss and being caught out when he told his wife, then taking too much time off sick and probably other stuff we don't know about. Her Mother is one of the directors of the company and it seems the sacking is legally above board of their part. She has since been on incapacity benefit and has DSS, aged 14, still living at home. DSD has left home and is at uni. Since she was sacked she has mentioned to DH that she has no money is living off £67 a week etc. DH gives her just under £400 a month, not agreed by the CSA, but in line with what they would ask him to pay and he pays extra fairly often for school trips , spending money etc.
Ex wife has fairly recently (since job loss) flown aboard long haul and it seems spend a large amount on Christmas presents and other expensive gifts and treats for the DSC. None of our business, but we did worry where the money was coming from as she has always claimed poverty but bought expensive things and we know she has remortgaged her house at least once.
Anyway, DH spoke to her last night and she told him she had been defaulting on her mortgage. She paid for holiday, presents etc on her credit card, which she obviously also is going to struggle to pay back. Her Mum is going to help with the mortgage this time, but she has told DH how much she is struggling and asked if he could help with some (admittedly minor) expenses for DSS. Obviously we are going to do that, but we are really quite worried for her.
She says that other than maintenance she gets only £67 a week, but surely this can't be right? Wouldn't she still get child tax credits at least? She isn't looking for another job, she has depression and says her counsellor has told her she can't get another job for at least a year. She won't talk to me at all and DH is useless at speaking to people, but we aren't in a position to financially bale her out and not sure we should anyway, but any ideas how we can help?