Hi there, my child was diagnosed in 2019 with uc and to be honest for any parent or family member it is a very difficult time to grasp what is going on at the beggining. Not only are you terrified for your loved one but you have this strive in you to do whatever you can to help them become healthy and have a good quality life.
I wont be able to do justice to your question but I believe that sending your love thier way helps, a kind word, a listening ear, offering to helping them out in anyway and being a form of a support system.
For us parents who have children suffering any illness knowing you have people around you that are there to support you even with the slightest thing can be a form of comfort.
Hope that helps