I'm even less experienced in the doggy world than you so feel free to ignore my input
I asked for a dog constantly but never got one, then a month after I moved out and went to uni, guess what my parents did? Bought a lovely little doggy!
Anyway, all I was going to say was that the breeder that we found first of all seemed to tick the right boxes and seemed lovely on the phone. Full of "I still get Christmas cards from people who've had puppies from me" and "Of course they're brought up in the house and have lots of cuddles" and I was happily going along with it. But I was a little uncomfortable and pushing a few things to the back of my mind. She hadn't had her dogs optigen tested because she'd never had a problem with it in the past, and she sent us a photo at 2 weeks, and it was just one, very blurry photo that didn't really show anything. I just pushed some things to the back of my mind but fdound that thinking about the puppy gave me a litttle knot in my tummy. Eventually it became obvious she was a commercial breeder
(Thank to COLers) and although devastated, we walked away. We have now found an amazing breeder who we are 100% happy with and its a whole different experience. Ihaven't got a knot in my tummy when I think about the pups and I'm not pushing anything to the back of my mind. So although heartbreaking, and it must be worse for you with kids, we definately did the right thing. I would be sat here now wondering if everything will go ok, but I'm sat here wondering how I'm going to pass the next week without driving eevryone mad!
I feel very unqualified to give advice, but just wanted to say that if you feel it is wrong then you are probly right. Walk away and find a new puppy and it will be like a weight has been lifted! Good luck.