I remember when I was a kid and had no idea how dinosaur species worked... I assumed Rooter had been his father, and his speech on "Not all of us arrive together in the end" was also in regards to his long lost son. I mean hey, they were both green and had horns, right? They MUST be related...
Of course now I know that can't be, but I do feel like at least Rooter was someone who lost someone dear to him.
Anyways sorry that's not what this topic is about... IMO they either died or just headed off without him maybe thinking that the egg would never hatch. As Ducky said, he was late. At least he'll always have Ducky's family.