Political instability in Saudi Arabia is growing as King Salman bin Abdulaziz begins to overhaul the Saudi government, putting a long list of family members into positions of influence while increasing the power of his son, Deputy Crown Prince Mohammad bin Salman. These actions have the potential to lead to a direct conflict with Crown Prince Mohammed bin Nayef. The expected internal power collision, predicted by many analysts, finally seems to be heating up. http://oilprice.com/Geopolitics/Middle-East/Saudi-Power-Struggle-Could-Destabilize-The-Entire-Middle-East.html
The horoscope of Saudi Arabia  provided by Astro-databank is used here.
In a national chart the 10th house is the King or ruling government while the 4th house is the opposition. Here the Gemini Moon in the 4th square Mercury refers to family and siblings constituting the opposition. The progressed Sun opposite the Moon implies trouble in the family enhanced by Saturn currently transiting over the progressed Sun.
Astrologer Martha Wescott  has researched extensively on the use of asteroids and TNPs. She has shown conclusively that adding asteroids and TNPs to a chart brings precision to delineations. For our purposes here we list the solar arc progressions in the chart for Saudi Arabia.
Saudi Arabia2 - Natal Chart
22 Sep 1932, 5:56:34 pm, LMT -3:06:52
Riyadh Saudi Arabia, 24°N38', 046°E43'
Geocentric Tropical Zodiac
Placidus Houses, True Node
Selection: Solar Arc Dirns1
P1 (H) Asp P2 (H) Date Pos1 Pos2
Sun Sqr Mer Sa-Na 15 Dec 2016 23°Sg41' D 23°Vi41' D
Sun Sqr Tisiph Sa-Na 3 Aug 2017 24°Sg19' D 24°Vi19' D
Sun Opp Mon Sa-Na 26 Dec 2017 24°Sg43' D 24°Ge43' D
Sun Sqr Juno Sa-Na 16 Apr 2018 25°Sg02' D 25°Vi02' D
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JUNO: Partners; maintenance of one's rights or position with other; question of “rights” and fairness/compromise; enforcement of fairness.
TISIPHONE: Seek justice for "crimes against kinship, family."
Relationships are difficult because people feel hurt and are out for vengeance. Finances are tied into what has been perceived as unfair.
Unfairness and injustice is evident in sibling relations.