At the age of 25, Tycho committed a serious social offense
1. Tycho took a woman who was not born an aristocrat as his partner
2. It was illegal for the young couple to marry in the usual way
3. However, provided they lived together for three years, their partnership would be recognized as a legal marriage
4. Tycho's wife was Kirsten Hansen, daughter of a Lutheran minister
5. Tycho and Kirsten had eight children, six of whom survived to adulthood
6. The form of marriage between the couple meant their children were commoners, not entitled to enjoy any of the privileges of the nobility