Mars in the 3rd House: Sibling Rivarly Astrology Research July 2, 2018May 24, 2023 by astrologyplace Mars in the 3rd house is famous for sibling rivalry. This rivalry may or may… This content is for Full Moon Membership and Solar Lifetime Membership members only.Log In Register Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Tumblr (Opens in new window) Related