Its a messy long story but its all come out that she has been building up debts in her mothers name (76 and frail), we think in her old addresses, then when the companies chase her, she gives them her mothers address and they chase her. MIL is now paying £80 per week of her daughters debts as she is scared of getting in trouble from the companies. She doesn't want to report her daughter as she says she is her blood and doesn't want to send her to prison and apparently it would be different if she was a stranger. (this is DH's half sister, same mum, different dad).
She has borrowed literally thousands of pounds on the promise of paying her back but never does. She even said she would pay the debts (mentioned above) but now they've had an argument, MIL is being chased again as she isn't making the payments. She is an evil evil person and needs to be stopped. MIL's partner died a couple of weeks ago and she is already heartbroken as it is, this on top is too much. The money he left her won't come through for a few months and she has nothing to live on in the meantime (possibly her pension?). She is housebound too, very ill - DH's other sisters/brother are doing all they can to pop round and do shopping etc and look after her but she is over an hours drive away.
Thing is, SIL has always been forging names etc - she stole DH's inheritence when his father died many years ago by forging signatures, we think to the tune of around £60k (a portion of which was DH's for when he turned 21, he's 33 now). Again, MIL wouldn't take action because she is her flesh and blood. We think she may have some sort of hold over her and is blackmailing her. I've already called crimestoppers but they said that unless MIL co-operates, there's nothing we can do .
We've had nothing to do with her for a few years as she is poison but she used to brag about getting all sorts of benefits - thinking of reporting her for benefit fraud as a start to get the ball rolling but not sure what she might be claiming etc. ?
Any advice would be much appreciated - might not be able to get back on here till tonight...
TIA xx