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First,some background information:

15 years old

5 foot 7

190 lbs

Lift 3-4 times per week

Hit about 500 balls per week Titleist 910D3 driver
My stepfather thinks that by lifting I am going to lose flexibility in my swing. I told him that as long as I stretch before and after my flexibility will not be hindered, but rather increased as a result.
What I do on days Callaway Diablo Octane Tour DriverI lift:

Exercise             Weight            Reps                         Sets         

Full Squat              275                 7                              4

Bench                   150                  10                            3

Incline                    135                 8                              3

Tricep Pushdown       150             10                              3

Single Arm Ext.        40                15                              4

Dumbbell Press         55                10                             4

Front Squat             185                 8                             3

 
Core Workout for 15 minutes, PING Scottsdale Anser 2 Putter then 15 minutes of jump rope. After this I stretch extensively for about 15 minutes. Anybody think this will hinder my flexibility, and if so what should I change?