A tearful grandfather said in court yesterday that his baby grandson had been very loved by his parents despite the fact that the pair allegedly caused the child's death. Lam Ker-sing, 76, testified as a prosecution witness in the trial of his son, Lam Lui-yin, 38, and daughter-in-law, Yim Ching-ting, 32. The couple has been jointly charged with one count of wilfully ill-treating or neglecting a child in their custody between December 2003 and February 7, 2004, the day when their 21/2-year-old son Lam Bok-yam died. The baby died due to a fatal head injury. He was the eldest of triplets. The elder Lam said he and his wife, Chan Shun-ho, lived with the defendants and their triplets at a public housing flat in Tsz Wan Shan 'harmoniously'. He said Yim's pregnancy in 2001 had brought the whole family a lot of joy, and they were even happier when they knew Yim was carrying triplets. 'Sometimes when my daughter-in-law needed to go to the market, my wife would help her to look after the children,' he said. Bok-yam had been under hospital care from birth until he was 26 months old. He suffered from congenital heart disease and sustained chronic disease and developmental delay after various operations. Defence barrister Bruce Tse said that on one of many home visits from the hospital, Bok-yam had tubes in his nose and he could not walk properly because his legs were so weak. Mr Lam said the defendants had kissed and hugged their children at home and they loved spending time with them. He sobbed in the witness box after the trial judge had asked him if he could remember the last time he saw Bok-yam, he replied he could not remember. He told the court that he was not sure how many occasions he had seen Bok-yam since the boy was discharged from hospital and brought home. Mr Lam and his wife testified yesterday that they could not recall anything particular on February 7, 2004. The hearing before District Court Judge Bernard Whaley continues today.