Hello,
There are a number of siblings to Sir John Dineley Goodere and Samuel Goodere, the fraticide brothers, but most of them are not mentioned in the various reports of the murder or in subsequent printed pedigrees.
In fact there were 6 sons and 3 daughters born to Sir Edward Goodere (Goodier, Goodyere & variations) and Eleanor Dineley.
The one you are looking for evidence of is Edward Goodere the eldest surviving son at his death, which was probably between June 1702 and September 1706. He was born in Charlton, Worcestershire and baptised in Cropthorne, Worcestershire on the 5th June 1684.
About the only things I have ever found for him is his baptism record and the mention of his death in a duel while serving in the army in Ireland in the fraticide publications. Mostly these are in reference to the promotion of John Goodere to be the heir to the Dineley estate and his subsequent name change to Dineley or Dineley Goodere, as stipulated in his grandfather's Will. However, there is no other contemporary mention of Edward Dineley that I have ever come across.
Neil