Break in Continuous residency with re-entry permit?

[kira888]

14 months after my parents got their Greencard, my mother had to leave the US for about 18 months for cancer treatment (Her doctors advised her not to travel during her treatment and her treatment was based off of a successful clinical trial drug not available in the US)

We obtained a re-entry permit for them before they left and have all the documents pertaining to her illness. Because they stayed out of the country for 18 months, will their continuous residency clock reset to zero? Even with the re-entry permit and a valid excuse for staying abroad? They still have their bank accounts here and they live with me and plan on living in the US permanently.

Thank you.

[jnk]

She will not have any problem in re-entering as long as she carries all her medical records but as per my understanding her continuous residency will reset to zero. You can consult an attorney.