Family Group Sheet| FATHER | | Lucas Grouwstra | | BIRTH | 17 March 1905 | Gaasterland | | DEATH | 28 September 1997 | Balk | | REF # | | 20812; | | FATHER | Gerben Gabes Grouwstra | | MOTHER | Siementje Willems Vlink | | | | MOTHER | | Gerritje (Gretha) Duijf | | BIRTH | 11 May 1907 | | | DEATH | 14 July 1998 | Balk | | REF # | | 20840; | | FATHER | Ane Luitjens Duijf | | MOTHER | Johanna Bingman |
| | | CHILDREN | | 1. | Anne Grouwstra MALE | | | REF # | | 20889; |
| | 2. | Johanna Grouwstra FEMALE | | | BIRTH | 21 May 1935 | Gaasterland | | DEATH | 18 April 1999 | Balk | | REF # | | 20843; |
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