MASSIVE name change for this one but yes I have, and still do, and it's a Jeremy Kyle style disaster saga.
But the underlying circumstance is pretty unusual and frankly the kind of horror story that spawns MRAs...
Once upon a time a wee little romantic DH was working overseas and fell in love with a beautiful charming mad woman (official diagnosis BPD, various other cluster B traits for good measure, drink/drug problems on top) and decided he could protect her and save her and MAKE HER NEVER BE SAD AGAIN. Long story short, they were pregnant and married within a year, and 1 year after that he had been deported for 'DV' (took guilty plea without understanding visa implications) , she was in inpatient detox and bub was in foster care.
3 years pass, ex wife has cleaned up act, regained custody, new man, all seems OK.
5 more years, she's drinking again, kid is at risk again, new man is charged with DV and rape. But new man has lawyer money, lawyer accesses phone and email records and (TWIST!) Ex wife is under investigation for harassment false allegations etc.
She grabs kid, hops a cheap flight out of the country and proceeds to try to drink herself to death in off season resort. Picks up local child endangerment charges, kid goes to foster care again.
DH is informed of developments, and after sorting out Hague convention stuff brings his kid (who he barely knows) home and sends ex wife back to rehab. It doesn't stick, she hops another flight to UK, TRIES TO KIDNAP CHILD FROM SCHOOL, is arrested etc etc and finally ODs in a park.
Couple years later I meet a nice divorced dad with full custody, get told there's a bit of baggage and can we talk before things go any further...
I almost bailed immediately, but agreed to look at some of the paper trail and then had a very long phone call with an amicable ex gf who backed it all up completely. And when I eventually met future stepkid (poor poor kid!!) they talked about ex wife openly planning false accusations, being coached to lie to police etc and were an all round great kid who had concluded that dad was pretty nice actually and that it's lovely to live in a calm cheerful household.
Happyish ending, we got married so I could adopt stepkid, therapy is a big help, GCSEs are being sat next year.
Dunno what the moral is, but I treated it as big assertions need really big proof and trod very slowly and carefully (which suited me at the time anyway). And I never get to discuss this outside immediate family because it's a fucking soap opera and I can't be arsed dealing with the assumptions that either I'm a deluded ninny or DH is a MRA warrior and I'm some noble tradwife. Also stepkid is mortified and we figure it's more their story to tell than ours.