Where do I start??? (sorry it will be long)
Last year my sister mentioned to me that she'd been seeing a married bloke who she knows from school (he drops his kids off). I tried to point out what would probably happen (she's also married with 2 kids) but she had it in her head that she wanted to move in with this bloke she's been seeing for 2 weeks and live happily ever after with him and her kids. I told her that it will be messy blabla and she said 'oh no, ds is best friends with his ds, they'll love living together' 
- cuckoo land!!! Anyway, tried (in nice way) to make her see sense but never got through. I told her I thought it was great she was getting attention again (as she'd gone from size 24+ to size 12 figure) but that's all I thought was good about it.
Anyway, this is about a year ago (ish). Her dh found out ages ago and so did the rest of my family. The boyfriend and his wife split up and the rest has been pretty much hidden from the family (my parents are just trying to help but she's been getting a lot of advice about working it out with her dh and sorting her life out but she obviously doesn't want to hear it).
In the last week or so, my family have discovered her dh's blogs (online diary for those who don't know) and have been keeping an eye out. Lots in there which has made us aware of the latest situation but I won't go into that.
What's worried me is that last week my sister sent a text to my mum to pass on to all the family, basically saying sorry for everything and a kiss on the end. This worried me, my sister doesn't do kisses. She's taken overdoses before and so it made me think. I tried to get hold of her but couldn't but part of me thought it would be ok as she's an attention seeker anyway and has taken overdoses before and then told us straight after - this is her way of getting us on side without having to apologise about stuff.
Anyway, after reading the blog, we discovered that indeed she had tried something on that day. It looks like she took an overdose (then threw up) and cut her wrist - lots of blood on towel etc. We're pretty sure that she's done this as she now has realised she wants to stay with her dh but she's run out of chances and he won't have her. I'm pretty sure she didn't actually mean to end it but just to make him feel like he has to take her back.
Anyway, he's not having her back but sounds like he's trying to help her sort her head out. Well, last night she moved in with her bf as she's the type that just won't try it alone.
I'm really worried she's lost all grip with reality and don't know what to do. She wants custody of the kids yet has been staying 2 hrs drive away and not getting back to take kids to school even though promised. Her xdh is very lucky that work are understanding about his lateness but he must be careful. So, she wants custody but is never there for her kids and did herself harm - I'm afraid my sister at the moment is an unfit mother and actually better off with their dad :(
I can't get through, only by text and when she replies, it's just I'm ok and kisses - she's covering up. I want to offer my brother in law support but am not supposed to know what I know and he's not a fan of our family since xmas (long story) . Don't know what to do. He's having trouble with school runs/work and neighbours have been getting involved but starting to get p'd off about it (know this from blogs).
What do I do??? Do I just be honest with him and say I know and can I help or should I keep out.
This is my neice and nephew - haven't seen them for ages now :(
Sorry it was so long!