Possessive forms

Are those possessives correct?

my sister-in-law´s and her husband children

our prime minister´s house

my cousin´s son´s girlfriend

Queen Elizabeth´s and her oldest son property

Thank you very much for a help


  • DavidCrosbieDavidCrosbie ✭✭✭
    edited January 16

    @Babeta1221, the second POSSESSOR without an APOSTROPHE is unacceptable.
    I would prefer

    • the children of my sister-in-law and her husband

    • the property of Queen Elizabeth and her eldest son

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