
I think people are being very nice about the amount of work ONE pup of this type is likely to be..
Try 'high chance of complete child-chewing screaming NIGHTMARE... for the next six months at least'.
That is NOT to say that terriers are never ok for a first time owner, or with kids, absolutely not and i am hardly a die hard anti-terrier person (with two dogs who have a good dollop of terrier ancestry, i never would!)...
But - this breeder is wanting your money and does not give a RATS about either you, your kids or the pups future. You can tell this by the way they were willing to sell you two same sex pups and by the drivel they told you a bout it being ok because they are crossbreeds.
If they tell you that level of BS - then thats just the tip of the iceberg tbh, these pups wont be socialised, wont be happy confident little things, wont be easy going cuteseywutesey puppies at all.
All dogs have the ability to be and to use aggression - its a tool in their toolbox just as barking or appeasing or working with you or running away or acting the clown.
Terriers are more likely to pull aggression out of their toolkit first - whereas say a collie is more likely to pull appeasement out.
With a WORKING bred terrier, this is even more true - these dogs are bred to survive no matter what, to take on the world and win, or DIE trying - if you LIKE that sort of thing and are prepared for it and can work with it, they make fantastic dogs.
If you have children who cant or wont understand, or do understand but physically cannot move around or exit the room without being inherently exciting to a ferocious bundle of terrier pup... you are goingto have huge problems. (and again thats just the tip of the iceberg!). The littlest misunderstanding where working bred terriers are concerned can turn into a huge problem. Child may just want a cuddle and lean over to pick the pup up... puppy however might not want to be picked up and having been ignored when a lip is curled... just go for biting! I could give a lot more examples (and of course these misunderstandings are just as possible with other breeds too...).
If you are sold on the idea of a terrier pup - I would look at the pure Border terrier, from a reputable breeder producing KC reg pups, who breed for type and TEMPERAMENT. Borders are lovely little pups and whilst they can be fiesty when needed they can also be very very bidable and keen to please you.