A lokacin yakin da Faransa, William ya yi kokarin inganta matsayinsa ta hanyar yin aure, a shekara ta 1677, dan uwansa na farko Maryamu, tsohuwar 'yar Duke na York, daga baya King James II na Ingila (James VII na Scotland). Maryamu ta kasance shekaru goma sha ɗaya da ya tsufa kuma ya yi tsammanin juriya ga wani wasan Stuart daga' yan kasuwa na Amsterdam waɗanda ba su son mahaifiyarsa (wani Maryamu Stuart), amma William ya yi imanin cewa auren Maryamu zai kara da damar da zai yi nasara ga masarautun Charles, kuma zai janye masarautar Ingila daga manufofinsa na Faransa. James bai yarda da yarda ba, amma Charles II ya matsa wa ɗan'uwansa ya yarda. Charles ya so ya yi amfani da yiwuwar yin aure don samun damar yin shawarwari game da yakin, amma William ya nace cewa su biyu sun yanke shawara su rabu. Charles ya yarda da Bishop Henry Compton kuma ya auri ma'aurata a ranar 4 ga Nuwamba, 1677. Maryamu ta zama mace mai juna biyu a Amsterdam, amma ba ta sake yin aure ba.
A shekara ta 1677, ya auri 'yar'uwarsa Maryamu