Colourful building blocks are scattered across the living room floor and a thick rope for twirling dangles from the ceiling next to the dining table. Traces of children are everywhere in 75-year-old Marita May’s house in Bad Ems, a town some 75 kilometres north-west of Frankfurt, but no children live there. That’s because May is a so-called granny by choice or wish grandmother. In German, a Wunschoma is someone who acts as a grandmother but is not biologically related to their “grandkids.” A Wunschopa is the term used for a wish grandfather. For about 10 years, she has been regularly meeting w…