Pansy Parkinson is a lesbian, and her son, Leo, is the product of artificial insemination
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Anthony Goldstein married Terry Boot straight after leaving school, the two of them adopted Riley, then Terry cheated, and they got divorced
Anthony Goldstein then ran back into Zacharius Smith, and they dated for two and a half years before tying the knot. Their daughter, Ellie, was adopted through surrogacy
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Rolf Scamander and Luna Lovegood DID get married, but they BOTH could've been attracted to someone of the same sex, as Rolf is bi and Luna's pan. Thank goodness three out of their four kids are queer (you had one job, Ly)