Can you help me edit a Grandparents rights letter?

The letter is nice, though I think your expectations may be a bit unrealistic. Certainly, desiring a few extended visits per year is nice. Considering the distance, frequent visits just aren't going to be possible unless it is something that Michael wants to do. My advice would be to start small and try to build upon that. Maybe a brief fall visit (3 or so days), a brief winter visit (around but not on Christmas), a brief spring visit, and one longer visit in the summer (rather than three 1 week visits...a single 2 or 3 week visit might make more sense). The travel is an issue, so you might have to accept taking on more of the burden for making the trip. It might also be a good idea for you to plan to go there on some of those holidays. Sadly, if you want the relationship with Christopher, you are going to have to make most of the effort. There just isn't as much incentive on Michael's end, even if he knows it is good for Christopher to have a relationship with his grandparents. Make it easy for Michael and you might get more of what you want.