I can very highly recommend the Orleans Hotel & Casino (located on Tropicana a mile off the strip, but with a strip view) as a kid friendly accommodation in Las Vegas.
The top floor has a full movie theater, arcade, bowling alley, and one of those big things kids play in with ball pits, nets, tubes to climb in, etc. The casino itself has a gorgeous pool, decent restaurants, and the gambling is affordable there too.
Every room is a suite, and the prices are very reasonable. I would *definitely* recommend it. It’s just about the only place I’ll stay in Vegas once I had kids. Hope that helps!!!