Bound Morphemes are used to signify Possession and include many Allomorphs.
What gender is my Waitress? What is the bound morpheme that tells us that? And what about the Prince and Princess--Which one is wearing the glass slippers?
4. Possession: What makes the slippers special anyway? Nothing unless you are Cinderella because they were Cinderella's slippers. Notice, the bound morpheme that expresses possession is spelled "s," but pronouned /z/.
But when she became the princess, we would have to say they (the slippers) were the Princesses. Here the allomorph is spelled "ses" but is pronounced /siz/.
If they belonged to Benz, they would have been Benzes /ziz/ and if they belonged to Pat, they would have been Pat's /s/.
There is certainly an impressive array of allomorphs for the child to learn to express possession.