Chest infection from my holiday i receive antibiotics and my 10yo sister received painkillers even tho she got the ci of me is that bad?

Need more info: I am not sure I understand your question. If your sister is ill now as well and was exposed to you prior to becoming sick, she may also need a similar treatment. However, even if you received antibiotics, if your illness (and hers subsequently) was from a virus, antibiotics would not be indicated. Was any testing done on your infection to determine the cause?