I thought I'd note some of the counsel that Elder Perry gave about teaching children to honor the Sabbath day.
"Our youth may think the old saying 'Sunday best' is outdated. Still, we know that when Sunday dress deteriorates to everyday attire, attitudes and actions follow. Of course, it may not be necessary for our children to wear formal Sunday attire until the sun goes down. However, by the clothing we encourage them to wear and the activities we plan, we help them prepare for the sacrament and enjoy its blessings throughout the day."
"Parents, now is the time to teach our children to be examples of the believers by attending sacrament meeting. When Sunday morning arrives, help them to be well rested, properly dressed, and spiritually prepared to partake of the emblems of the sacrament and receive the enlightening, edifying, ennobling power of the Holy Ghost. Let your family be filled with love as you honor the Sabbath all day long and experience its spiritual blessings throughout the week. Invite your sons and daughters to 'arise and shine forth' by keeping the Sabbath day holy, that 'their] light may be a standard for the nations.'"
-L. Tom Perry, CR April 2011