Depends on the age of your family members.
When our old, large dog (mellow breed) died, one of my co-workers ...... Surprise!!...... gave me a Jack Russell terrier pup.
Took it home. Kept it for a few weeks (including obedience training).
Then, one day, it lunged at our 3 year-old's face when he got too close to its food dish.
By the end of the week, the Jack Russell had a new owner. On the drive between our house and his house, the Jack Russell bit him.
Used to go to the Jack Russell trials...they keep ‘em muzzled for a reason.
My MIL has the meanest (and fattest) Jack Russell I’ve ever met. It HATES children. My MIL is convinced that she “just wants to play,” when she bares her teeth and charges. Once, it went for my (now seven year old) daughter, and I launched it like a shotput.
I had a cocker spaniel that had a similiar story!