Error is related to Problem. Problem is the opposite of Math. 
Experimental is related to Theory. Theory is related to Understanding. you are likely to find Understanding in/at/on Family. Aunt is part of Family. 
Error <--RelatedTo--> Problem <--Antonym--> Math 
Experimental <--RelatedTo--> Theory <--RelatedTo--> Understanding --AtLocation--> Family <--PartOf-- Aunt 