Hi, you can try the Ibis hotel which is at walking distance from the Chhatrapati Shivaji International Airport. It is located in Vile Parle East. The hotel also has a babysitting facility.
Another hotel is the Waterstones Hotel which is also at a walking distance from the Chhatrapati Shivaji International Airport and is in Andheri East. It has a beautiful nursery and even day care center, along with a gorgeous pool.
Hope your kids have a comfortable stay :)