Maria Lugo, a relative of Taylor’s boyfriend Juan Sebastian Lugo, wrote in a Facebook post, “Y’all were apart of our family, and that will never change. The greatest in-laws any one could ever have, and the sweetest, most wholesome and caring girls in my life. I look up to y’all so much. Y’all were a light in the midst of this crazy world. We will all love you two until the end of time.”
Lugo tagged both Madison, 17, and Taylor, posting a group photo with the sisters. A commenter wrote that Juan and Taylor were planning to get married on Monday and hold a large wedding later.
Madison and Taylor’s bodies were found lying in the street of Katy, Texas, last week. Police say Christy, 42, “convened a family meeting” in her living room and then opened fire on her two daughters, according to a press release from the Fort Bend County Sheriff’s Office.
Christy was killed by police after refusing to drop her weapon during a brief standoff. Investigators have yet to release a motive, but told PEOPLE that she suffered from mental illness and they had been called to the family’s home “for previous altercations” involving her “mental crisis.” According to the release, the sheriff’s office has responded to 14 calls for service at the Sheats’s home since January of 2012.
Taylor was first shot inside of the home. Christy followed Taylor into the street and shot her again. A witness confirmed to PEOPLE that Sheats went back into the home and reloaded her gun before coming out to shoot Taylor again.
Taylor was airlifted to the hospital where she died from her injuries.
An honors graduate of Lone Star College at CyFair, Taylor majored in Diagnostic Medical Sonography, the school’s admissions office tells PEOPLE.
“She was just such a sweet girl. She had tons of friends, me and him both. I just can’t believe it happened,” friend Matthew Wiley told ABC 13 of Taylor.
Added neighbor Faaiz Siddiqui, “She seemed like a nice person. I talked to her a few times. Especially Taylor. She babysat us a few times and my brother got tutor lessons from her. All I can say is they are nice people. There’s nothing wrong with them.”
Christy’s husband, the girl’s father, was at home when the shooting started but was uninjured.
• Reporting by HARRIET SOKMENSUER