This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of or pertaining to nepotism; favoring relatives because of their relationship rather than their abilities.

"The two back-to-back suicides sparked a month of protests in normally serene Tunisia - beginning with the economically-depressed Sidi Bouzid region, where trade unionists, students, and jobless youth poured into the streets to voice their frustration with a corrupt and nepotistic regime that has misruled Tunisia for some two decades."

nepotistical