The children of Helen Greer and WIsaac Mullinax were in Hopkins, Texas for the 1880 census. They were living with Mullinax and his new wife (Emily Lavernia Ann Perry).
The children of Helen Greer would have been: John J., Mary J., Sarah E., William E., and Theodotia E..
There is also listed a Febe (Pheobe) B. but she was the daughter of Emily and William Mullinax.
Please contact me at firstname.lastname@example.org