Link 1
Verhoeff - Verhoeff
Despite the fact that there is no hard evidence for a brother/sister relation between Engel Pieters Verhoef and Suzanne Pieters Verhoef, their family name, as well as the patronyme 'Pieters', are strong indications.
What's more, the two belonged to a small group of families around Jan Steen and Rembrandt, of which the Hasius family is the most important one.
Anyway, for the family relations, one link more or less doesnt make a decisive difference, as their is another link between Anthony Klok and Ariaentje Huygens Reesloot to Rembrandt's and Jan Steen's family: via Eliabeth Capiteins.