A DAD allegedly killed his four kids using a pillow and a knife to get “revenge” on their mum after she left him. David da Silva Lemos, 28, was arrested after Kimberlly, three, Giovanna, six, Donavan, eight, and their 11-year-old sister Yasmin were found dead on Tuesday. NewsflashDavid da Silva Lemos, 28, was arrested after the four kids were found dead at his home[/caption] NewsflashThe children with their mum, who left Lamos after he allegedly assaulted her[/caption] The children were found with stab wounds at their dad’s home in Alvorada, southern Brazil after family members called the police. Cops detained Lemos in a hotel in the neighbouring town of Porto Alegre early the next morning. He allegedly told police he given the children “tea” to pacify them before suffocating them with a pillow and stabbing them to death. The victims’ grandmother believes Lemos killed the youngsters to get “revenge” on their mother after they had recently split up. Idenise Martins da Silva told local media: “He had already attacked my daughter. “Their relationship had ended for good, but he did it to get to my daughter – I’m sure of it – in the worst way possible. “He is a coward.” Police said the couple had been together for 12 years. But they had separated in September after Lemos allegedly assaulted the children’s mother. The 24-year-old victim reported the incident to police and filed for a restraining order against him. Relatives said the children had been staying with their dad and had been due to go back to their mum’s house in the coming days. Cops said Lemos sent his ex-partner threatening messages shortly before the four kids were killed. NewsflashCops detained David da Silva Lemos in a hotel the morning after the kids were found[/caption]