Once there was a rich mother who wanted to test her three sons-in-law.

She invited her first son-in-law to walk with her along the lake. She fell into the lake and pretended to be drowning. The brave son-in-law jumped into the lake and saved her without a second thought. The next day there was new car in his driveway with a message across the windshield that said, "Thanks, from your mother-in-law."

The following day, she decided to test the second son-in-law by taking him to the lake. She fell in again, he saved her and he also found a new car in his driveway that said, "Thanks, your mother-in-law."

Finally it was time to test the last son in law. She fell into the lake and he didn't lift a finger and let her drown.

The following day, he also found a car, a sports car, in his driveway that said, "Thanks, from your father-in-law."