Rubuta ci gaba don wannan sakin layi - A cikin 1558 a Antwerp, Tishem ya auri gwauruwa kuma attajiri dan kasuwa kuma juror, Wouter Gruter (kuma "Walterus", "de Gruytere", da sauransu), asalinsa daga Breda. Suna da 'ya'ya hudu, Jan da aka haifa a watan Disamba na 1560. Mijinta ya sanya hannu kan Yarjejeniyar Nobles a cikin 1566, kuma don tserewa daga tuhuma a cikin Netherlands na Spain, sun koma yankin Calvinist na Dutch na Norwich. Wasu tarihin rayuwar Jan Gruter sun yi iƙirarin cewa Tishem ta samo asali ne daga Norwich kanta, kodayake Thijsmans / Thysmans sun kasance masu kula da Flemish na yau da kullun. Lokacin da ɗansu ya shiga sabon Jami'ar Leiden a Holland a 1578/1579, Catherine da Wouter sun koma Antwerp, amma Siege na Antwerp
a cikin 1584 ya sa su sake guduwa, wannan lokacin zuwa Lübeck sannan kuma Gdańsk. Wouter Gruter ya mutu a Gdańsk a 1588, kuma, a cewar Peter Fuchs, Catherine ta mutu a 1595.