RLS refers to Heavenly Parents in the July 1977 Ensign.

Date: Jul 1977
Type: Periodical
Source: Robert L. Simpson
LDS
Hearsay: Direct
Reference: Robert L. Simpson, “Q&A: Questions and Answers,” New Era (July 1977): 11
Scribe/Publisher: New Era
People: Robert L. Simpson
Audience: Reading Public
Transcription: The lofty goal of exaltation or living eternally again in the presence of our Heavenly Parents can only be achieved as a family unit, and only after that family has developed a Christlike pattern of living within a frame work of conformity to priesthood principles.
Source Link: https://web.archive.org/web/20210426160410if_/https://www.churchofjesuschrist.org/study/new-era/1977/07/q-and-a-questions-and-answers/why-do-we-feel-so-strongly-about-families?lang=eng
Citations in Mormonr Qnas: Heavenly Mother