Mercury square Mars -- "The Bolter?"
Does the natal Square of Mercury/Mars indicate a tendency to "bolt" -- jump ship, desert the post, abandon goals? My grandfather and I shared these three placements within one degree:
24 Aries Sun, 1 Aries Mercury, 0 Cap Mars.
Aries Sun could certainly be bold and impulsive, but would the Mercury/Mars Square explain why we each failed to keep commitments in our earlier years?
This would not be my first guess. Leaving is a Jupiter / Sadge / 9th house thing.
Escape / avoidance is Neptune / Pisces.
Mercury and Mars is fast thinking and fast walking. If in Sagittarius - then I would look at impulsive leaving.
Mercury Mars is not really about leaving though. It's far more likely to stay and fight.