Assisteerde zijn moeder samen met zijn broer Jan van de Merwede bij het testeren op 13 juli 1288. Mabilia was toen weduwe van Ghiselbert de Goye en van haar eerdere man Godschalc van de Merwede.
Zijn zoon, Daniel VII, wordt door de Graaf van Holland, verheven tot Baron van de Merwede, welke baronnie hij van die Graaf tot een onversterfelijk erfleen ontving. Deze zoon sneuvelde in October 1345 tegen de Friezen.
When copying data from this family tree, please include a reference to the origin: Rob Kuijper, "Family tree Kuijper", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-kuijper/I5998.php : accessed June 10, 2024), "Daniel VI van der Merwede (1258-± 1331)".
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