Other than flat out kicking them out, not much.
My suggestion would be to 'suspend' them from the house for awhile. Have them live on their own and see what it's going to be like when the time comes to finally part from his parents.
The son being uneducated makes it harder to accomplish that though since they are more than likely not going to find a job that pays well, or a job period for that matter.
If all goes well he should be running home to mommy/daddy begging to do better and to let him live there again within no more than a week or two.
I've seen this method work before with a friend's son who was 18 and quit high school, attempting to live off of his parents. It straightened him out, hopefully it will work for you as well.
I wish I could offer a better answer, but forcing humans to realize things is often very hard and frustrating. Don't give up!
Tagalog translation of MOTIVATE: udyok
That is the correct spelling of "motivate" (encourage).
Motivate Canada was created in 1994.
This ice cream will motivate the children.
You teach yourself English. Only you can motivate yourself.
Have a friend try different things to motivate you and soon you will find it.
Many people have different ways to motivate their staff, but the main ways to motivate your staff is to teach them that you should respect customers and your staff...
Here are three sentences using the word 'motivate': "It is very difficult to know what will motivate children to do more work." "We are hoping that Lucy's end of year report will motivate her to do better next year." "Having support from family and friends will motivate John to run faster in the race."
The noun forms for the verb to motivate are motivator, motivation, and the gerund, motivating.
My boss motivate me & team by giving new idea.
Guns can motivate the people they are pointed at, words can motivate millions.
Profit can not motivate ANYONE to own a business. only its APPLCATION CAN!