First thing I'll say is I am not a coach and many on here are better qualified to help you than I am but I have a few things I noticed...
1) I hope I'm able to do what your dad does when I'm 81. That's awesome!
2) your backswing is an arc that wraps behind your back and not in a linear motion. Almost looks like some no thumb bowlers I see but looks like you are using your thumb? I'm sure others will tell you it's important to try to keep that armswing in a straight line.
That's all from me...lol
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