They are typically a fair skinned, light-haired , round-headed Celtic people, who practice a variation of Catholicism - it includes more than a little of the ancient Goddess worship of the British Isles.
They tend to settle in clusters: setting up their own communities as much as possible. On cluster is is South Carolina; others in Texas and other midwest states.
Their specialty is theft: by deception, when possible; by more direct means when necessary. They sometimes use force. It is fairly common for a team to approach senior citizens and distract whoever answers the door, while other members of the team slip inside and steal whatever they can.
I was surprised to see the woman beat up on her daughter like that: daughters are usually treated with great "honor", taught how to please men at an early age, and more-or-less auctioned off to the highest (Traveler ) bidder. Bride prices are extremely high, and marriage occurs at the verge of puberty : all ideas we find apalling, but they take for granted.
I would guess the mother is an addict.It's the only reason I can see for risking the child's future value as a bride.
I have no idea if any of this is true, but it is interesting.