Let me explain:
Mars symbolized by the glyph for the male gender rules the 'rational' mind sans any emotional input, it rules the male gender as a whole, and it rules teh sign of Aries and co rules Scorpio. It is known to be related to war (Mars/Aries was the god of war in the days of gladiators and Ceasers), fatherhood, husbandry, and is usually associated with red or pink.
Venus symbolized by the glyph for the female gender rules the 'emotions' sans intellectual thought, the female gender, and rules Taurus and Libra. It is known to be related to child bearing, motherhood, wifehood, and diplomacy. It is usually associated with green or blue.
Now that we have the keywords, lets add a near-miss conjunction. Venus is trying real hard to keep up with Mars, but Mars will slide on into Cancer and butt heads with Saturn, whom is still trying to be obnoxious to Geminis everywhere, Venus will stay in Gemini twins for a while longer to balance out the departure of the war planets presence. Issues of partnership (not just marriage) will be present pretty much throughout the summer and into the fall and winter where Venus and Mars will conjnct. This is a year of change and upheaval, mars in Gemini was the ignition switch, Mars in Cancer will be the conduit. Venus will have to assimilate the powers of gemini intellect and temper it with patience.
The heat of June will only make things worse for the couples who are not in the best of relations right now, and adding in a family gathering will only make them either a)put up more of a facade or b)blow up in front of everyone. Once Mars leaves Gemini though it cools off in Cancer but the emotional impact remains the same. If venus makes it to Cancer then rationale will occupy the ring but until then watch your tounge, Mars based aggressivness tempered with Gemini/Cancerian emotions is not a light thing to mess with. (Regardless of Gemini and Cancer traditions of being 'shallow' these two signs are quite often overly complicated.)