The brother of 14-year-old Alaina Petty, a U.S. Army Junior Reserve Officers’ Training Corps (JROTC) member who was one of the 17 students killed in the Parkland shooting, took to Twitter on Saturday to blast a student who skyrocketed to fame following the shooting for using his sister’s name to push her anti-gun agenda.

The outraged brother, Patrick Petty, is also a student at Stoneman Douglas High School and proudly proclaims that he is a conservative in his Twitter bio.

In a tweet to the biggest celebrity to be born from the tragedy, Emma Gonzalez, Petty asked her to stop using his sister’s memory to push her agenda — noting that she “DID NOT and WOULD NOT support it.”