I have to agree with the others. Even if they provide services for kids, no casino is "family friendly." Casinos survive on gambling. There's a huge amount of drinking. Plus, casting no aspersions on Mogehan Sun or Foxwoods, you also find a lot of illegal activity and substances at many casinos.
Plus, Las Vegas tried to be "family friendly" a few years back. Some properties (I think the MGM Grand was one) even built small amusement parks. That lasted a few years, but the casinos themselves realized that the two concepts--gambling/casinos and "family friendly"--didn't work well together, and they soon abandoned that approach.
If you want "family friendly," go to Disneyworld. If you want gambling, go to Mohegan Sun and Foxwoods.