How about some songs who are related...from the glaringly obvious to the strictly impressionistic.....
Seal Driver and Bends Like a Willow are Cousins
Water Carrier is the son of Tall Thin Girl who is the daughter of Fat Man
Requiem and Summer Day Sands are Twins
Thousand Mothers is the mother of Son who is the father of Wind-Up
Inside is the Uncle of Home who is the Uncle of Dog Eared years who is the cousin of Gift of Roses.
Wondering Aloud and Jack-A-Lynn are friends
Back Door Angels has some DNA from Thick as a Brick
Whalers Dues and Strange Avenues went to high school together
Truck Stop Runner is an orphan
White Innocence is the step-daughter of Budapest.
I have deliberately ignored drawing any lines between A Passion Play and all the same era material later released on the 20 year box and Nightcap.....too obvious.