what should slick's middle and last name be?and is he royalty or not?

he was abandoned as a kid and was found by his sister Cristena.he is brother and sister with crystal(amy_rose12)his grandpa was apperently named slick as well and was married to crystal then somehow crystal and slick now ended up here now as bro and sis.slick had 3 parents the hedgehog left after the threesome and the cat and fox stayed together and soon released slick.he doesn't know of his last or middle name.he suspects the hedgehog was a desendent of slick and crystal in the past.