No independent genitive possible

I have read most of Barack Obama’s, as well as Michèle Obama’s.

I have read most of Barack Obama’s political speeches, as well as Michèle Obama’s.

I have read most of the Obamas' political speeches.

I’ll quickly run to the shop of the florist’s to get some tulips for my mum.

No independent genitive possible

I will quickly run to the florist’s shop to get some tulips for my mum.

I’ll quickly run to the florist’s to get some tulips for my mum.

A sister of mine worked as a nurse at All Saints’ Hospital for more than 20 years.

No independent genitive possible

My sister worked as a nurse at All Saints’ for more than 20 years.

My sister's worked as a nurse at All Saints’ Hospital for more than 20 years.

Every Sunday morning, a father of mine went to the bakery to buy breakfast.

No independent genitive possible

Every Sunday morning, my dad went to the shop of the baker's to buy breakfast.

Every Sunday morning, my dad went to the baker’s to buy breakfast.

There are four desks in my colleague's.

There are four desks in the office of my colleagues’.

No independent genitive possible

There are four desks in my colleagues’.

I prefer the writings of Sylvia Plath.

No independent genitive possible

I prefer Sylvia Plath’s.

I prefer the writings of Sylvia Plath’s.

No independent genitive possible

They are mine.

These keys are mine.

They are my keys.

In the room of Matilde.

In Matilde’s.

No independent genitive possible

At Matilde's.

The cat of my boyfriend has gone missing.

No double genitive

My cat's boyfriend has gone missing.

The boyfriend of mine's cat has gone missing.

No double genitive

Tim is a friend of Sarah’s.

Tim is Sarah's friend.

Sarah's friend is Tim.