More working adults are taking on the responsibilities of caring for their dependent family members. Despite strides made in recent years to alleviate their burdens, they say that more can be done to offer much-needed relief.  On paper, Ms Jacqueline Ang has only one employer, a university.  In reality, the 49-year-old holds two full-time jobs: technical manager as well as primary caregiver to her 23-year-old twin daughters with autism, her 16-year-old youngest daughter and her 75-year-old