I have a Golden Retriever (my 3rd) that has been very difficult to train. Quite unlike his 2 predecessors. I never approach him without a soft toy in my hand for him to bite. Otherwise he chews on me. I would not trust him around small children. He’s getting better (not yet 2) but it’s been a slow process.
Having owned and trained dogs for over 50 years. I decide a long time ago that life is to short to put up with dogs that are hard to train.
Dogs that can’t be trusted are not worth keeping around.
Do you really want to put up with a PITA dog for 12 to 15 years.