How can worrying be disappear?

Today, after went to 扫墓, my dad went to see the doctor that I worked for.

In the morning, my dad asked if I still have the urine dipstick as he said his urine seemed pretty red. While at the temple, my mum asked my dad if he still feel pain. I do not know what pain she was referring to but I was also quite worried about my dad since he complained of reddish urine in the morning. So I asked him if it was still the same. Guess the pain my mum was referring to was not what I think. So after asking my dad if it was still the same, he also answered in context with what my mum meant.

In the consultation room, my dad only told the doctor the pain that my mum was referring to which is the back pain. In the end, when I told the doctor about my dad's uring in the morning, my dad said it was alright after that.

Just now, while working, when there aren't any patient and I need to change money with the doctor as we ran out of small changes. He asked me about my dad, if he is feeling better. He then said that I looked very worried about my dad. Who won't be? He asked if I am the only child too.

Well, worrying won't disappear if anyone had sibling(s) but I guess the burden, the worries, the stress might be lesser. Maybe that is why I might have the word, 'worry' written on my face.

Anyway, how can I not be worried about my parents?

My mum had problem with her urine before. My mum still having the swelling problem with her legs. The Chinese Physician said it's due to menopause period. Yet she is consistently worrying about my cousins

My dad fell down & fractured his wrist before and had 2 surgery for the fractured wrist while working before. He kanna bronchitis before. He kanna Dengue before.

How can I not worried about them? How can I be at ease?