child of someone's stepaunt or stepuncle / stepchild of someone's aunt or uncle.

Alternative form of stepping stone

(informal) A stepfather.

plural of stepbrother

plural of stepchild

Alternative form of step ladder

One's parent's spouse who is not one's biological parent

A stepfather of one's spouse.

(rare) The sister of one's stepparent / (rare) The stepsister of one's parent

plural of stepaunt