What does « en » refer to in « en avoir la dignité »?

Question

Tu ressembles peut-être à ton père, mais tu n’as pas l’air d’en avoir la dignité.

= "You have the look of your father, sure, but you don’t exactly exude dignity, unlike him."

= [you don’t have his dignity]

Am I correct in assuming that the sentence can be rephrased as:

Tu ressembles peut-être à ton père, mais tu n’as pas l’air d’avoir la dignité de {lui / ton père}.

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If so, can you also say something similar, such as:

Tu ressembles peut-être à ta sœur jumelle, mais tu n’as pas l’air d’en avoir la gentillesse.

or: Tu ressembles peut-être à ta sœur jumelle, mais tu n’en as pas la gentillesse.

= "... but you don’t share your sister’s kindness"

Answer 1

Yes, en refers to ton père. Generally speaking, the pronoun en stands for de + noun. See When to use the pronoun en? for a general introduction to pronouns and prepositions.

Here it would be possible to use either sa or en:

Tu n’as pas la dignité de ton père.
Tu n’as pas sa dignité.
Tu n’en as pas la dignité.

The meaning is roughly the same, but there is a subtle distinction. Using sa suggests that the father's dignity may have been transmitted to the child, whereas using en merely suggests a similar dignity. However, this nuance is rather weak; it would perfectly possible to say “sa dignité” even if the people involved were not related and there was no suggestion that the quality was transmitted.