So the father is unknown.
There is a certificate stating that the father is unknown. But there is something to tell! The lastname Tighelaar suggests that the unknown father has this lastname too. The firstnames Pieter Ynzes suggests that the father has the firstname Ynze (Ynzes with the s at the end, meaning “son of Ynze”). Wich results in the name of the father: Ynze Tigchelaar. Often firstnames were passed on to there children, so Pieter might be the firstname of the father. And so we end up with the name of the father: Ynze Pieters Tigchelaar
This Ynze has trully lived in the timeframe Lijsbert lived. And also around the place Lijsbert lived. And so a connection is there between Lijsbert en Ynze but without being married. And from this relation, Pieter Ynzes Tigchelaar was born, being the forefather of this family Tichelaar this family tree is all about.
Lijsbert had two sons, both of them named Pieter. The father of the first Pieter is not certain but might be Ynze Pieters Tigchelaar.
The first Pieter was born in 1815. His mother Lijsbert died in 1822, Pieter was 7 or 8 years old at that time, and was left without father or mother.
The second Pieter was born in 1825, from Ynze Pieters Tigchelaar and Trijntje Douwes van der Schaaf, married in 1824.
Both Pieters are half-brothers. But it is not likely that they were raised in the same family, due to the fact that the boys have the same name.
These are all assumptions, without any evidence but very likely. One problem is that the names mentioned above were quit common. The names were spelled differently: Cuperus was also known as Kuperus or Kuipers. The name Ynze was also spelled as Yntse or Ynse.
Another thing is that the lastname Tigchelaar was adapted in 1811 by law of Napoleon, Ynze being 20 years of age, there is a certifiate for this. It is not clear (yet) if the lastname was used before that time. Probably yes, because the profession was related to the name Tigchelaar.
Is is very important to connect the half-brothers named Pieter. This can be done with the modern DNA technics, read this page about this! This test might prove the relation between Lijsbeth and Ynze Pieters!
