I’ve given this some thought, and what I have realized is that English does indeed have an accusative case for pronouns. I guess translating we have:
direct object accusative
indirect object dative
So, for pronouns in English, we have (subject, object, possessive or nominative, accusative, genitive):
I, me, my
Ich, mich, mein and its gender and plural derivatives
You, you, your
Du, dich, dein and its gender and plural derivatives
He, him, his
Er, sich, sein and its …
She, her, her
Sie, sich, ihr and
It, it, its
Es, es, sein and …
We, us, our
Wir, uns, unser …
You, you, your
They, them, their
It is still pretty reduced compared to German, but I wrote a little program that does pronouns in German. It can help to know what case your in, if you substitute a pronoun in the sentence for the noun.
Reading about languages, the language group, I know the best is called Italic. It derives from Latin, seen in inscriptions from the 6th century BC, and in literature from the 3rd century BC. The Romance languages are French, Spanish, Portuguese, Italian, Romanian, and Sardinian, as well as Occitan, Rhaetian, Catalan, and are spoken by about 500 million people.
The germanic languages (of which English is one) derive from the migrations of Germanic tribes who lived in northern Europe during the 1st millenium BC. The earliest main text is a Gothic Bible translated around 350 AD. There are about 500 million people who speak germanic languages that include:
Swedish, Danish, Norwegian, Icelandic, and German, English, Yiddish, Dutch, and Afrikaans.
ref: Cambridge Encyclopedia of Language (David Crystal) 1987 Cambridge University Press.