Michigan skiing as a destination removes places such as Caberfae and anything south of Cadillac or north of Macinaw from consideration.
Crystal Mountain, Boyne Mountain, Boyne Highlands and Nub's Nob all have exactly the kind of stuff you are looking for - friendly and reliable ski schools, great services, nearby amenities, restaurants, on-hill nice accommodations, stuff for the kids, etc.
Although I would rate Nub's as the best skiing of the group, I've got to say one thing about the friendly staff at Crystal Mountain. One time while skiing there when I was a teenager I got separated from my buddies and I ended up riding up with a retired ski patroller. He had worked there for 35 years and he was just out for a nice ski day. After asking me a bit about my skills, I had to admit I was mostly a self-taught survivalist on the hill. He told me to shadow him for a couple of runs - which I did. He began to give me excellent advice and showed me all sorts of drills and practice tips - things I still think about today. He did all that on his own time, and for free, without me even asking. I suppose today is my first chance to pay him a thanks by recommending Crystal Mountain,Michigan as a great family friendly destination Michigan resort to do some fun skiing.
Lots of runs, good snow, great amenities - just not a whole lot of vertical - but I don't think beginners care much whether a hill is 400 feet or 550 feet (that's about what you'll get from Michigan outside of the 900 at experts only Mt. Bohemia, which of course, is located somewhere just south of the North Pole.)
Have a good trip !!