If the line is on your property, the estate needs an easement from your lot. The buyer of the estate lot needs to bargain with you for an easement, and you should try to alert the title company, broker, or buyer of the encroachment Without that easement, you can remove the septic line.
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In addition to Attorney Pyke's answer.
Why not just list your property for sale
at the same time with the same broker when your mom's
property is listed.
The answer given does not imply that an attorney-client relationship has been established and your best course of action is to have legal representation in this matter.
I agree with Mr Pyke as usual and Mr. Pippen stole the words out of my mouth. If the use of your property was permissive, you should also discuss with a real estate attorney the best way to protect your property interest.
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