Since the publication of the book, the following corrections and supplements have been made.
Ps-1. By "the book" is meant both the digital and the paper version, in both the Dutch and the English version.
Ps-2. "Seijseners" means all members of the family tribe, including all variations of the name. 
	
		Processed on date  | 
		Supplement / correction - Details  | 
	
	
		May 2, 2020  | 
		Received from: Obituary notice 
		Concerns person: Cornelia Josephina Magdalenia Seijsener [VIII-bu) Mentioned as Cornelia Josephina Maria Seijsener by mistake 
		Mutation: Cornelia died on May 2, 2020 in Raalte, leaving behind:
		 Her husband Piere Saraber  
		Her children Jan Brouwer, Nelleke Brouwer, Aad Brouwer, Peter Brouwer, Angelo Saraber and Pierre Saraber Jr and their partners  
		Her grandchildren Amber, Victor (†), Grietje, Gijs, Minneke, Quirien, Max, Tess, Britt, Ignátio, Benoît, Thérèse and Lorenzo  
		Her great-grandchildren Bram, Koen, Oskar, Rosa and Hugo  
		 | 
	
	
		May 16 2020  | 
		Recieved from: Lidy Seysener 
		Concerns person: her household 
		Mutatie: Lidy sent in some wedding photos of herself and her children, which unfortunately could be included in the book by the expiration of the deadline. Below are the references to these photos, which will open in a separate pop-up. 
		 | 
	
	
		June 17 2020  | 
		Received from: Sander Paap 
		Concerns person: Adriana Anna (Jeanne) Seijsener (VII-an) 
		Mutatie: Sander Paap is the great grandson of Jan Seijsener and Cornelia Kaptijn.  
		Through him I received the names of the (grand) children of his grandmother. This grandmother, Adriana Anna (Jeanne) Seijsener was married to Albertus Veldhuis. Seven children were born from this marriage: 
		
		Co Veldhuis, born ± 1922  
		Johanna Maria (Hanny) Veldhuis, born october 18, 1932, died march 25, 2019 in Beverwijk, married june 21, 1958 to Wilhelmus Johannes (Wim) Paap; 1 son (Sander Alexander Maria Paap)  
		Corrie Veldhuis  
		Margaretha Maria (Gré) Veldhuis  
		Bertus Veldhuis  
		Sjaan Veldhuis  
		Margaretha Maria (Margriet) Veldhuis  
		 
		
		 | 
	
	
		July 1, 2020  | 
		Received from: Frans Seijsener 
		Concerns person: Couple Johannes Antonius Seijsener and Anna-Maria Benvenuti [IX-aw] 
		Mutation: De date of their marriage was August 17, 1964, instead of August 19, 1964.  | 
	
	
		July 1, 2020  | 
		Received from: Jos Seijsener 
		Concerns person: Bram Seijsener and Kim van Herp [X-ad] 
		Mutation: April 27, 2020 their daughter Fenne was born in Bredam Noord-Brabant, Nederland.  | 
	
	
		July 19, 2020  | 
		Received from: Bianca Maria Wilhelmina Seijsener 
		Concerns person: Children of Johannes Petrus Maria Seijsener [IX-bp] 
		Mutation:  
		The date of birth of  Bianca Maria Wilhelmina Seijsener  is   24  February 1982 . The book erroneously reads   14  February 1982   
		The first names of the mentioned  Johannes Hendricus Seijsener  are in reality   Gertjan  Johannes Hendricus   
		  | 
	
	
		August 6, 2020  | 
		Received from: Koos Seijsener (IX-bu) 
		Concerns person: Martijn Seijsener (X-as) and Miranda Seijsener (X-at) 
		Mutation: Martijn Seijsener and Masoumeh Kangarani are not married, but live in legal cohabitation        Miranda Seijsener and Johan van Dam are not married, but live in legal cohabitation.  | 
	
	
		Augustus 6, 2020  | 
		Received from: Koos Seijsener (IX-bu) 
		Concerns person: Family of Koos himself 
		Mutation: Koos has sent a number of photos, the most important of which I listed here: 
		 | 
	
	
		October 2, 2020  | 
		Received from: A.H.C.M. (Alphons) Maas 
		Concerns person: Johanna Cornelia Seijsener [IX-aq] 
		Mutation: Photo marriage de Jong-Seijsener Alphons Maas sent me this photo, which was taken on January 20, 1962 at the wedding of  Johanna Cornelia Seijsener and Quirinus Johannes de Jong. On the photo from left to right: Hendrik Arnoldus (Henk) Seijsener: father of the bride; Johanna Geertruida (Jo) Schipperheijn, (steph)mother of the bride; Quirinus Johannes de Jong, bridegroom; Johanna Cornelia Seijsener, bride; Maria Cornelia Pieterse, mother of the groom en Johannes de Jong, father of the groom. The names of the children in the foreground are not known. Quirinus Johannes de Jong is the founder of what is now "De Jong Kampeer & Recreatie" in the Zilk (Noordwijkerhout).   | 
	
		
	
		October 10, 2020  | 
		Received from: Dick Zwaan 
		Concerns person: Cornelia Sybilla Seijsener (Lia) [IX-ay] 
		Mutatie: Obituary Lia Seijsener Lia passed away on October 2, 2020. See obituary.  | 
	
	
	
		December 12 2020  | 
		Received from: Dick Zwaan 
		Concerns: Helena Wilhelmina Seijsener [IX-aa] 
		Mutation:  Helena Wilhelmina Seijsener passed away in Hillegom on December 6, 2020. The inscription in the obituary shows that  Helena Wilhemlina Seijsener  had descendants. 
As far as correctly interpreted, these are the following (grand) children.
 A daughter named Jolanda Lammers, married to Tom and their children:
  Naomi  
 Brigit 
  
A son named Toby Lammers, married to Saar and their children:
  Mick Lammers  
 Joey Lammers 
 
  | 
	
	
		May 30, 2021  | 
		Received from: Obituary 
		Concerns person: Quirinus Leonardus Seijsener (1939-2021) 
		Mutation: Quirinus Leonardus Seijsener passed away on 21 May in Lisse. The cremation took place on May 28, 2021 in Lisse.  |