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The more your sump pump runs the less chance there is of it freezing up.
Correct me where I'm wrong cellarwater.
It sounds like you could modify your cleanout to act as an emergency bypass in the event the pipe freezes. The solid cleanout cover could be replaced with a small round grate that fits in the opening. This would allow water to back out of the system at the cleanout in the event pipes further towards the curb freeze. I agree with your father in law, you probably won't have a problem, but if you do have a freeze-up, you want the system to continue evacuating water from the sump.