Just Saw New TCM

the man in the weilchair was 1 a leatherfaces victims but sum how is now living with them
weird lady from trailer was leatherfaces sister
the baby was the daughter of the hitchhiker

I was thinking of putting the wierd lady in the trailor as Leather's sis. That's what my cuzins told me. But I thought it made more sense if she was the cousin.
But did you see the pic of the hitchiker's family? Witch one was she? I couldn't tell. Who was the lady holding the baby in the pic?