Two young children

Found at flea market in Ft. Worth, TX. Two blond haired children. Both look to be under 6 years old.

My mother found this picture at a flea market in Fort Worth, Texas and thought it looked similar to her brothers and sisters, but could not be for sure. There was no information on the photo. Also it says POST CARD on the back and it was once in an album because it has black paper in the 4 corners of picture on back where it had stuck to black paper in and album of some sort. Does anyone know who these children are?