My daughter married a man with a twelve-year-old son. They had been dating for over five years. Now that they are married:

  • Am I technically the boy’s grandfather?
  • Are my daughter’s siblings his aunts or uncles?

Does getting married constitute those titles. What if they separate, do you now lose the titles because he is not a blood relative.

  • 4
    Is this about English Language ?
    – Centaurus
    Jan 4, 2017 at 14:41
  • 1
    @Centaurus: Yes, it is. Different languages denote and comprise relations in a different manner.
    – Wrzlprmft
    Jan 4, 2017 at 14:50
  • 4
    What does religion have to do with this? Religion does not equal culture, it just interacts with it. It may be relevant if you want to interpret some doctrine that explicitly pertains to some kinship, but that depends on the original language of the doctrine (if you care about that) and does not necessarily have to have anything to do with everyday English language.
    – Wrzlprmft
    Jan 4, 2017 at 15:11
  • 3
    I would call you his step-grandfather, but I don't think there are any rules about what he has to call you. Jan 4, 2017 at 16:46
  • 1
    @Centaurus: How does my edit change whether this is about the English language?
    – Wrzlprmft
    Jan 4, 2017 at 23:06

1 Answer 1


If you want to be his grandfather, and he wants to be your grandson, and you behave in a grandfatherly way towards him, and your daughter and his father have no objections, then you are grandfather and grandson.

The Queen's English supports this. The son of the Queen, Prince Charles, called Lord Mountbatten his "honorary grandfather". (Lord Mountbatten was his father's uncle.)

As for your daughter's siblings, they are the boy's aunts and uncles if they, the boy, your daughter and his father want them to be.

In English, the people involved choose the words in situations like this, and in the US, at least, it is nobody's business but their own what they choose.

(If your daughter and the boy's father divorce and you and the boy still have a close relationship, you can continue to be his grandfather if you and he want it.)

The legal ramifications (e.g., division of your estate if you die intestate) are beyond the scope of this site.

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