Yes, he was the eldest child.
You can say it both ways.
Yes Beyonce is the oldest child of Mathew and Tina Knowles.
The adjective 'eldest' is a synonym for the adjective 'oldest'.There is no difference between eldest and oldest.
The eldest child in "The Famous Five" series by Enid Blyton is Julian. He is the oldest of the four children who make up the group of young detectives.
Well of course the parents are older but the oldest child is Louis
The Queen's eldest child is H.R.H. The Prince Charles, Prince of Wales, born in 1948.
John Adams was the eldest of three sons.
Rupert is the oldest child out of his siblings. The second eldest is his brother James born in 1990, thrid eldest is Georgina born in 1993, second youngest is Samantha born in 1995/1996 and the youngest is Charlotte born in 1998
If you have read the book and/or seen the movie you would know that it is Darry. Darry is the oldest, Sodapop is the middle child.
If you are talking about the Disney Show, the eldest would be the main character Penny Proud
Usually, The oldest sister is called "eldest" and the youngest sister is called "youngest" or "smallest".