In the few quiet moments you have, try to think about all the good times you had with your parents. Even the little ones. When my mum was in a home, it was the first and only time we sang happy birthday to her and she thoroughly enjoyed it. That one moment brings a tear of joy to me even now and not only my sister and I but all the other residents and relatives singing along as well. I'm sure you must have some stories like that.
Good luck.