pag. 439, 440, 551.
She is married to Gerlach Theodorus van der Capellen.
They got married on January 23, 1764 at Utrecht, she was 16 years old.Source 4
grandparents
parents
brothers/sisters
children
http://www.geni.com/people/Frederika-Johanna-Yvoy/6000000022334786518
https://books.google.nl/books?id=UhFiAAAAcAAJ&pg=PA288&lpg=PA288&dq=frederica+johanna+van+hangest+d+yvoy&source=bl&ots=GKvc-kOQ3O&sig=Ve5vz3n3U4g5aU2t4gMKhGNBm5Q&hl=nl&sa=X&ved=0ahUKEwixn4Tfu8DJAhWCDSwKHZTLB28Q6AEILTAD#v=onepage&q=frederica%20johanna%20van%20hangest%20d%20yvoy&f=false
http://www.dbnl.org/tekst/molh003nieu08_01/molh003nieu08_01_0375.php
https://www.dbnl.org/tekst/molh003nieu08_01/molh003nieu08_01_0375.php