This is a question as much about language as about Webtrees.
I have a grandfather who is the son of a second marriage, after his father's first wife had died. In the "Father's family with First Wife" Webtrees gives the title 'step-mother' to the first wife even though she was dead before my grandfather was born.
Is it conventional in genealogy that any first wife is described as step-mother to the child of a second wife, even if the first wife was long dead and not involved in any parenting?
Is there something I could change in the creation of the relationships within webtrees that effects the title step-mother?