After watching your videos, the first thing I would suggest is taking bigger steps. You take very small steps for being pretty tall, and that causes you to stay very upright and stiff, and makes it so you don't slide very much. You want to be smooth and relaxed while bowling. Also, you don't bend your knee enough while releasing the ball. By bending the knee it will help you keep under the ball a little better and get better ball roll. Right now the ball comes off your hand a little late, and it doesn't roll off the thumb then fingers. It is kind of being tossed off your hand instead of rolled. You do come up the side of the ball a little, but that will be solved by knee bend, and keeping your shoulders on an even vertical plane with your bent knee. On the positive side of things, your timing is good, and your arm swing is fairly smooth. So you have a good building block there. If you have any further questions feel free to ask. I love to help!
As for your brother, he has a pretty good approach. His timing is good, his knee bend is good, and he appears to have good balance. The only issue I see with his swing is that his wrist comes around the side of the ball instead of up the back. This causes the axis tilt to aim farther toward the ceiling. This will cause weaker ball reaction, and deflection after contact with the pins sometimes. That is a much harder problem to fix via written post, but there are some great videos on youtube about axis tilt that may be helpful to him. Good luck to both of you!
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