So....belle-mère is both step-mother and mother-in-law?
Pull down menu errors: Does NO ONE at Duo do a quality-control check to assure that the information in the pull down menus is relevant to the current exercise? An ongoing frustration; for example, incorrect verb forms in this set.
That's correct. They are hints about the words, not answers to the specific problem, so they don't always match up.
is "dont" not a suitable substitute for "alors", here?
Not dont, but donc might be.