Can a red kangaroo and a grey kangaroo breed with each other?

No. These are different species of kangaroo, and kangaroos do not breed with other species.

The grey kangaroo consist of two species which will not breed with one another - eastern grey kangaroo (Macropus giganteus) and western grey kangaroo (Macropus fuliginosus). Neither of them breeds with the red kangaroo (Macopus rufus).