Johannesburg - The son of a South African expat family, living in California, has been arrested for the murder of his mom and younger brother, The Sunday Tribune reported.The man appeared in court this week for two felony counts of murder, the ABC7 News Network reported. A firearm was apparently the weapon used and had been found inside the Irvine house.The murder of Gloria Pillay, 58, also known as Lulu, and Arlyn Pillay, 36, took place when they arrived home last Tuesday. Arlyn had gone to the airport to fetch his mother after she had been away at an art exhibition. The station reported that witnesses claimed to have heard someone shouting “I’m sorry, I’m sorry” during the incident.Arlyn was also an artist, and had moved to the US as a child.The family was originally from Reservoir Hills in Durban and had moved to the United States 15 years ago."Nobody seems to know the motive," Rosanne Narandas, Lulu's niece, told The Sunday Tribune.ABC7 reported that Lulu was the owner of an art gallery in Palm Springs. Arlyn had been a graduate of the Art Center College of Design in Pasadena.Arlyn’s friend Victor Kumar told ABC7 that the artist had before his death planned two art shows for Friday and Saturday which went ahead to allow the public to pay their respects.A local TV station, KMIR, reported that it is being considered a domestic homicide and that her shop "Lady Lulu" remains closed as people leave flowers in remembrance of Lulu and her son.The L A Times reports the murders are the first in Irvine this year and the suspect is "scheduled to be arraigned" on February 8.