So, so many. I seem to attract them & realise it's made me both extremely astute with people & very guarded.
A supposedly good friend of over 20 years who secretly hated me. I'd helped he a lot over the years including training & employing her against my better judgement. Pushed DH & i together & then drunkenly told me when I was 6 months pregnant that he was her back up incase her current relationship when wrong & she wanted him back now
. Naively I brushed off as drunk talk, but it got worse. She tried to sabotage my wedding by "accidentally" dropping the cake. Another friend actually dived & caught it & repaired it before I saw it at the reception. DH later told me she'd made a serious pass at him that day & she tried her best to wind us up to argue by throwing herself at him all night, even pushing me out of the way to sit between us. I went through a sex discrimination & constructive dismissal case & turned out she was the only witness against me & had been sabotaging my work for months. She was dropped by us both & she's actually approached DH at events & tried to rekindle friendship. No apology though, apparently it's time I "got over myself" toxic, manipulative & narcissistic & not dealing well with getting older & im told really peed off that I didn't get fat after having DD 
Brother, where to even start, but golden balls also despises me & this came to a head a few years ago & he finally owned up & gloated to destroying my relationship with mum. Lying, manipulating. Very narcissistic, though mum was too & I was always scapegoat when I wasn't back looking after him. I helped him a lot when he took ill & was about to be homeless. I was very ill myself & the stress of DB fighting with DH who was giving him money to pay a mortgage he wasn't paying, was destroying me, but I got him benefits & got him rehoused. Once settled he set about stirring up trouble with Dad, told him that DD had cancer & I was keeping it from him & DF who is also very volatile & can be abusive & was as kids believed him over me & stopped speaking to me for months. I went through cancer testing with my own DD at the same time my friend did with her DD. Mine didn't have cancer but something else. Friends DD died. DB knew this, yet still thought this was an okay lie. When I tackled him over it & asked him to tell dad the truth, he initially blamed dad & feigned worry that he was senile. After a while he not only owned up to it, he gloated & owned up to being behind many, many upsetting & baffling fights with my mum. I had a very successful career, DM said I was actually a prostitute & that's how I made my money. Kicked off that I could afford handbags for several thousand pounds, which I didn't have, but she refused to believe. The weirdest rows that left me reeling time & again. He gloated that he stirred up every one of those puzzling fights. DM knew in the end who was there for her & it wasn't him & she apologised just before we lost her.DB went no contact when he won a load of money. Though is back bugging dad again & telling dad he's having urgent cancer tests.his number has called me too, but missed call. It's a horrible place to be where he's still my little brother & I was brought up to put him first, but he is an evil, evil man who only thinks of himself. A good example was my asking why he thought it okay to have our severely disabled mum do his washing & pay his mortgage.... he thought it made her feel needed & he was doing her a favour 
so much more, I could write a bloody book on that family triangle & I still feel uncomfortable with extended family as I don't know what lies they were told about me