、。
My mother and I are different in every way.
Literal
Mother [and-と] I [topic-は], every point [in-で] differ.
あらゆる is a pre-nominal ('every, all') that attaches directly to a noun — it's distinct from すべて ('all' as a standalone noun or adverbial). Here 'every point' = 'every respect.' The で on 点 marks the domain or respect in which the difference applies ('differ in respect of X'), a slightly more abstract use than the spatial 'at/in.'