I started looking at diesel, but quit because they are hard to find, and when you do, they are much more expensive. I am looking at RVs from the 1990s to early 2000s. At some point along this...
I can't explain them all but DW, DH, DS and DD would usually be some descriptive adjective starting with D, such as dear, darling, darn or whatever Wife, Husband, Son or Daughter.