Baldwin
Baldwin was born about 1056 in St Omer, Pas-De-Calais, France.  He died after 1097.

 Ida De Brabant
Ida was born about 1056.

 William De I St. Omer
William De I was born about 1070 in St Omer, Pas-De-Calais, France.  He died in 1128.

 III Baldwin
III was born in 1087.  He died at the age of 33 in 1120.