It will get better I'm sure newpup!
Our setup is probably not ideal for other families, but I'll put it here in case it helps anyone else who is reading. Basically we've just all been basically staying apart which has definitely helped, our lounge is now really pup's room (kitchen/diner/upstairs belongs to the cats
) and we have all moved upstairs whenever pup is napping, as I find a well rested Pup is much less of an arse! Then when she's awake it's mostly just me with her supervising, or training and playing. I found that she is much better when there's only me, it seems DH and the DC just (unintentionally) drive her wild with excitement. Even when the kids are sitting quietly it's just too much for Pup!
The freeze stuff etc didn't work with my DC either. DD was a statue every time while pup barked or leaped around which was great, but DS just panicked, shrieked, flapped, ran away so undoing everything me and DD practised. I still try to remind him to stand still, but I'm also consistently rewarding Pup's calm behaviour after watching Kikopup 'capturing calm' video, plus working out what toys and treats are irresistible and also knowing her tiredest/calmest times. Once pup started being calmer around just me I then had DH around more in the lounge, then only just this week had DD sitting with us a bit more. She is younger but far braver than DS, so she's happy to be a guinea pig - but we only have her in the lounge when pup is knackered, calm and engaged with her favourite chewy things. My hope is the more DH and DC are starting to be gradually present in the room, pup will associate them with feeling calm and relaxed and getting her tasty chews. I know that when she is overtired she jumps up at even me and gets extra nippy, so I make sure that we generally stick to 1.5 hours awake then crated for nap. That has definitely helped reduce biting and being rough.
I also let her do some biting of my hands when she wakes up from a nap as she's less aggressive then, but at no other times whatsoever. She knows that No and Ah-ah mean she's getting too rough and at that point I'll introduce a chew toy, mostly she changes to licking me and rolls over for a tummy scratch. However just a few weeks ago I would never have thought this would ever be possible and my hands have been totally shredded so many times!