"can't speak to the dad as I've no idea who he is and only know the street where they live not the exact house"
Sorry but wtf?!!!!
I was maybe more cautious as I'm a survivor of csa myself, but like hell would my 14 YEAR OLD DD have stayed overnight when I didn't even know the address!! Let alone know the parents WELL.
NO FUCKING WAY was she allowed to stay over with people I didn't know where I didn't even know the address!
You sound VERY passive in all this. Your child is still very much A CHILD.
YOU need to parent here. A man you DON'T KNOW tried to ply your CHILD with alcohol in a sleepover situation!
I also held with the "slow supervised introduction" of alcohol around this age but ONLY at home and ONLY low alcohol drinks.
You need to take a step back and reset how you are supervising your child, because this is an AWFUL incident waiting to happen!
Frankly the 14 year old sounds the most sensible out of the lot of you!
"But at nearly 15 I can't really ban sleepovers" of course you can!! You can certainly set rules for them!
Only with people you know & trust (this would mean you'd also know address & phone number & they yours)
Only with X amount notice
No alcohol or drugs
No mixed sex sleeping arrangements
It's not hard!
My dd went on plenty of sleepovers at her friends houses with parents I KNEW & trusted and who had similar boundaries to me.
"You don't meet other parents when they're at high school do you?" Yes! You make the effort!
"If dd needed me she could call." Would you expect a 14 year old who's very drunk & possibly shocked by being assaulted by her friends father to be able to give a coherent address?!!
Tbqh I'd be seriously considering if he DID do something to her!