The phrase "ancillary issues" refers to smaller or less important matters related to a main or central topic or problem. It means the additional or secondary issues that are connected to the main focus. Full definition
Can the court consider a parent's religious observance, independent of ancillary issues such as that observance's impact upon a child, as a factor in awarding custody? (gregoryforman.com)
Annabel advises clients on all aspects of the Home Office's Points Based System (particularly Tier 1 and Tier 2) as well as Sole Representative visas and a wide range of ancillary issues including the immigration implications of TUPE; indefinite leave to remain and naturalisation applications; UK entry requirements for spouses, dependants and other family members. (squirepattonboggs.com)
Ancillary issues Accepting equity as payment for your services also engenders an intangible set of concerns — ethical ones. (inc.com)