أَبٌ → أَبِي : my father.
أَخٌ → أَخِي : my brother.
حَمٌ → حَمِي : my father-in-law.
هَنٌ → هَنِي : an indirect/euphemistic “thing.”
فُو → فِي (common) / فَمِي (reported variant): my mouth.
ذُو means “possessor”; this is not ordinarily annexed to a pronoun.
The six nouns are ab, akh, ḥam, han, fū, dhū; their first-person constructions are not identical.