Make sure they have all that need to be happy and you can help them, if needed.
1.Respond to what they say. If they ask for something try to do it as quick as you can and don't complain about it.

2.Be cheerful. Smile and remember you are doing this for the people you love.

3.Offer to help. Ask to see what needs to be done.

4. Do chores. If you notice that they're in pain help them with the chores around the house they might just pitch in a reward for you and make them as comfortable as you can.

5.Spend time with them. If you really love them spend some time by their bed talking with them about their life or just do what they want you to let them know how special they are to you and that their needed.
Source: wikihow.com