Sure, they often are given passes for incentives, singing in CP, etc. They are welcome to give those to anyone. They can also trade in points earned for special things that they can give to others.
Some CM's can get more than 3 in with them due to their family size. Meaning, if they have 3 children and a spouse, Disney will let them get 4 in plus themselves so they can bring in their whole family. Some CM's don't have limitations on how many times a year they can bring people in, depending upon their "rank" - my mom can just get them in 12 times a year. She can also get up to 50% rack for herself, or up to 40% off for family/friends on hotels. Plus discount on merchandise and food.
Course the pay really stinks ROFL!