Welcome to BYC...you're received a lot of good links, and they should keep you occupied for awhile! BYC is kinda like YouTube. You start out looking for a video on how to take apart your tricky vacuum cleaner to clean it out and end up still glued to the computer 3 hours later looking at humorous ballet performances.
It's very hard to suggest breeds or hybrids for someone else. You've got a good start by having an idea what you want. Now you have to also consider cold and/or heat hardiness, whatever is best for your area, and how involved your grandchildren will be in their care. My grandkids were all over the chickens! I could leave my then 8 year old mildly autistic granddaughter, Katie, in total charge of the chickens when we left town for a few days at a time, and never even had to check on her. My grandson Evan, not so much! He'd take care of them, but he didn't care about them one way or the other.
Kendra, our littlest granddaughter, loved the chickens......if she wasn't out there helping gather eggs she was staring out of the open front door or on the couch at the window watching them, squealing "chickens!" and even calling some of them by name. She was 2 when we first got them, 4 when we started helping her handle them, and even more impressive was knowing that she has been in her wheelchair since she was 9 months old and is autistic and mostly non-verbal.
So as you can well imagine, we had to have chickens out there we could totally trust 100%. Kendra couldn't have gotten away from a nasty chicken even if she'd understood that she should try! That meant being willing and able to cull any aggressive chicken if we had to, even a favorite like "Scout". Chickens I can replace...Kendra, Evan and Katie deserved to feel safe at all times. I found the best ones for US in OUR situation - eggs, meat, overall temperament - were our Brahmas, especially our Light Brahma (Tank), our Orpingtons, and the kids all loved our Easter Eggers. The EEs didn't have a lot of meat on them, but they made up for that lack in their personality, appearance, and the different colored eggs. Lots of meat on the Brahmas....we actually had 16 of them. We had 8 Light Brahmas and 8 Buff Brahmas. When we processed them, Tank got a reprieve simply because of her good nature and bond with Kendra. Same with the Silkies - not much for eggs and meat, but eye candy to the hilt and most are so friendly.
Remember two things....they are chickens. They are living, breathing critters, not Pez Egg dispensers. Compromise is critical. Mediocre egg production is perfectly acceptable to me IF the chickens laying them are calm, steady, not disruptive to the flock, and I'm not trying to make a living off the egg sales. And the second thing to remember is that within every flock there are stinkers. While we can give you generalities based our own experiences, every bird has it's own distinct quirks. When I started out in chickens and was at the research point where you are now, I heard over and over again how wonderful Golden Laced Wyandottes are. Well, I couldn't get rid of the 5 that I bought fast enough! Bullies with feathers. Mine didn't fit the mold. So you see, generalities are fine, but guarantees are impossible. A mixed flock is always a good way to start!
Good luck, and welcome!