As an ex care assistant, ex-nurse, and now carer for my family members, you are vital. Patients will tell you things they didn't even think to tell the nurse as you help them with their daily needs. You will be the one that notices that Mabel is less energetic than normal, is finding things more difficult than yesterday, is less chatty - those signs come far before her physical observations will change. You will know that Gary likes to have his wash after breakfast, but that Terry doesn't feel ready for breakfast until he's had a wash.
As a carer: Please know that if a parent needs to stay on your ward, they really will need to. One of my daughters is 18, and needed to stay in hospital last week. She has SEN, but doesn't have an obvious learning disability. I spent one night awake in a chair, 4 nights sleeping on a floor, and one night in a broken reclining chair that I propped up with a hard plastic chair. I managed to get a single pillow and a blanket on night 2. No parent willingly sleeps on a hospital floor if they could go home to a comfortable bed.
You are the person that will make relatives feel that their loved one is safe. Nurses take on such an overarching role now that the care assistants are the ones who are really getting to know their patients.
If you do night shifts, please help to promote a culture of respect for sleep. Sleep is vital to patient recovery. Having staff talk at full volume at night is awful. Especially when it is non-clinical talk about staff politics, or their upcoming holiday.
Lastly, I know that visibility is important for safety, but there are ways of being able to see your patients without needing the curtains completely open all day or night long. DD2 didn't sleep for the first 2 nights because they insisted on keeping the curtains completely open. She didn't feel safe at all.