How relationships are calculated

is a complete mystery to me

Salomon Zelig Mozes is your great aunt's ex-husband's brother's wife's first cousin twice removed's wife's father's wife's grandmother's husband's niece's husband's sister's husband's first cousin once removed's wife's first cousin once removed's wife's nephew's wife's sister's husband's first cousin twice removed's husband's first cousin once removed's wife's brother's wife's brother's wife's first cousin once removed's husband.

yet is son

Alexander Sender Salomon Zelig de Groot is your fourth great grandfather.

2 weeks ago Salomon was still my 5th g-grandfather...