Pierre I De Grandson Seigneur
Pierre I was born about 1190 in Neuchatel, , , Switzerland.  He died about 1234.  He was buried about 1234.

 Agnes De Neuchatel
Agnes was born about 1205 in Neuchatel, , , Switzerland.

 Amadeus De Grandson Seigneur
Amadeus was born in 1229 in Neuchatel, , , Switzerland.  He died at the age of 71 in 1300.  He was buried in 1300.