An AMBER alert has been issued for the children, 7-year-old Luluvioletta Mariposa Bandera-Margaret and 14-year-old Lilianais Griffith.
Round Rock police on Sunday discovered a woman's body in a home, and now an intense search is underway for two missing children.
Terry Miles' vehicle [Photo: Round Rock PD]Griffith has brown hair, brown eyes, braces, and a nose stud on the right side of her nose.
The girls are believed to be with Terry Allen Miles, a person of interest in the suspicious death case, CBS affiliate KEYE-TV reports.
The relationship between the woman and the two girls was not immediately clear. Miles has a beard, hazel eyes, and wears glasses.
First pics of 'SUPERMOON' over United Kingdom as it reaches its peak TONIGHT
The moon is set to reach its perigee, at a distance of 3.56 lakh km from the earth, at 3.34 am and will set around 7.54 am. The supermoon on January 31 is also known as the Blue Moon since it's the second full moon of January.
Authorities are also looking for 44-year-old Terry Miles, who they say is connected to their abduction. She has light brown hair, brown eyes, braces and a stud on the right side of her nose. Bandera-Margaret is 4 feet 5 inches tall and 75 pounds, with curly brown hair and brown eyes.
Neighbors on Leslie Court said Sunday night was not the first time police showed up to this home.
Authorities said Miles may be headed to Louisiana.
The girls are believed to be in extreme danger, according to the National Center for Missing & Exploited Children.
If you have any information regarding this abduction, contact Round Rock PD at 512-218-5516.