The four-year-old Hong Kong girl flying to Australia for a heart operation is looking forward to one thing above anything else after her life-saving surgery - having a baby brother to hold and play with. Tang Tsz-ching's wish will come true in three months' time when her mother gives birth to a second child. But the pregnancy presented her parents with a dilemma because they feared he too might inherit Tsz-ching's rare heart defect. 'We have been told by doctors that Tsz-ching's condition might be inherited and there's a five per cent chance for the baby to be born with it. So we had a really hard time struggling over whether to keep it,' her mother, Tang Cheng Yin-kwan, said. What made them decide to keep the baby was Tsz-ching's delight at the prospect of being an older sister. 'She often says she's bored and wants to have a younger brother. Everything I do is for the sake of her, and if a brother is what she wants, I'll go ahead despite the risk,' Mrs Tang said. When asked why she wanted a brother, a shy-looking Tsz-ching replied: 'I want to hold him.' Apart from fulfilling Tsz-ching's wish, Mrs Tang said she hoped by being an older sister, Tsz-ching would know better how to take care of her illness, which is expected to stay with her for the rest of her life. 'I want her to keep in mind she's the elder sister and she must take care of herself and be healthy in order to protect her younger brother. I hope that will push her to hold on and live longer.' Mrs Tang said Tsz-ching's condition had left her pale-faced since the day she was born. It had also caused her to suffer swelling of the muscle on her chest. The couple were devastated when they learned of their daughter's condition two days after she was born. The girl's father, Tang Kwai-wa, said: 'We were really depressed, but we got over the shock very soon as we knew we must face the fact. You just have to give the best to your child whatever happens.' Mrs Tang said she often cried when she saw Tsz-ching suffering from chest pains and when she did her daughter comforted her. 'When I cry over her illness, she comes over and tells me 'Don't worry mum. I'll be all right'. 'She knows what is happening to her but she manages to consider how we feel. She's very mature for her age and speaks like an eight-year-old.' Tsz-ching is a bright and alert child who finished second in her kindergarten class last year. She had to give up her schooling last month but her classmates will throw a party for her at school before she leaves for Australia on Wednesday. Mrs Tang was forced to quit her merchandising job to care for her daughter. 'I hope to be able to find a job as soon as possible when I get back to Hong Kong. We have to return the money to the school director, although he said we don't have to. We don't want to owe people money,' she said.