How come Sia is unaware of her father's illness? That's really strange to accept. Her father is having Lupus from past 20 years that means during the onset of disease sia was at young age but after getting into medical college to till now when she herself is a practitioner doctor, couldn't able to see that there is something wrong with her father.
i'm not satisfied with illogical reason her father gave for her unawareness. Its almost impossible to hide Lupus and its symptoms. How come Sia did not see her father loosing weight, hair fall, rashes on skin, weakness, problem with sunlight, persistent fever, pain in joints or body and many more. Over the years symptoms get worsened and affects other organs as well. At least she could have checked her father's blood report ,how could have she ignored elevated ESR/crp level, ANA score, medical history, reports, his medicines, follow up routine etc.
Living under same house it is not possible to give a check on father's health and his reports.