@kathp
Good morning,
Based on my family’s history I believe there is at least a strong predisposition for unilateral acoustic neuromas to be hereditary. My families Acoustic Neuronal story starts 96 years ago in 1926 when my grandfather died from one. Almost 67 years ago his son (my dad) had one removed in 1955 and in 1960 his Mom had one removed. My parents had two children and neither of us had one but when I was 42 (the age my grandfather and father were when they had theirs) I went lickety-split to the doctor and demanded a brain scan. My brother's grandson had one at 15 and also my great aunt had one as well.
So I don't buy into the bilateral only hereditary theory.
Fingers crossed for your children,
Jake