The Narragansett gene is sex-linked recessive. From what I have been able to learn, a Royal Palm is a Sweetgrass with Narragansett added. So my tom, being a Royal Palm, will have all Narri daughters, and all sons being split to Narri but not visual for it.
So with the Sweetgrass hen, all the chicks will have all the Sweetgrass genes from both parents, but only the girls will show the Narri, turning them into Royal Palms. The boys will be split for the Narri, so they will look like Sweetgrass, but could make Royal Palm children with the right mate, (just not 100%).
The sex-linked recessive genes work differently than the sex-linked dominant genes. I think chicken people are most familiar with the dominant kind.
Any pairing of a Narri male with a non-Narri female will give you sex linked poults, assuming none of the other genes the parents are carrying will hide your ability to see or not see the Narri.
Aww, I typed all this and R2elk beat me to it with a more condensed version!