REWARDS - Lowrider challenge, Cesar's mission, Twice whatever you bet (max of $2000 if you bet $1000)
You see some more family arguments going on and you'll have to follow your sister to her boyfriend's place. Simply get to the yellow blip on the radar and enter the red marker. The person owed your brother from way back and puts in hydraulics on a car for free. Feel free to enter the mod garage to check it out, but the low cash you have might make you want to wait (you don't need any modifications to finish the mission).
From the garage, head towards the lowrider meeting by following the yellow blip on the radar. Drive into the red marker in the parking lot to begin the lowrider competition. You'll need at least $50 for the first wager in the competition. This is a pretty easy mission, so wager how much you want to. You'll need to press the right analog stick in the direction indicated as it passes through the circle.
The mission is a success when you outscore your opponent and your reward is double the amount of whatever you wagered. Kendl is ecstatic at your victory and introduces you to Cesar, her boyfriend. Cesar's friends don't like you and the introduction doesn't go well because of this. However, Cesar mentions that he loves your sister and also compliments on your lowrider.