In Chapter 4 of the book, Jonas is doing some of his volunteer work at the house of the old. All that we really see him do in this chapter is to give the old people their baths.
Jonas comes into the home and the lady tells him it is useful to have volunteers today because they are behind schedule. Then she says that he should go and join Fiona and Asher who are both helping in the bathing room. Jonas goes and helps a woman named Larissa with her bath.