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I've seen this theory floating around and they usually cite:

  1. Both having very similar noses Dr. Nefario's pointy nose is also old-man droopy

  2. Dr. Nefario dancing with Marlena (Gru's mom).

However, is there any actual canon material (such as commentary or interview) hinting that Dr. Nefario is Gru's father?

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up vote 24 down vote accepted

No, as you can see from the family tree that was posted on the official Minionmadness website, Felonius Gru (known to us as simply "Gru") is the son of Robert and Marlena Gru.

enter image description here

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Hang on, is one those ancestors a wolf? – James Sheridan Jul 26 '14 at 1:25
@JamesSheridan - He certainly looks quite wolf-like – Valorum Jul 26 '14 at 6:14
He may not actually have been a wolf. He may have been a werewolf transformed by an accident of science... Victorian Era science was notoriously unreliable... – Thaddeus Howze Feb 23 '15 at 22:07
Why not? Nefario who very well could be Robert, does resemble the "younger" Robert. I mean...look in the mirror 25-30 years from now...who is that old geezer, and more importantly, where did that younger you go? – user48111 Jul 12 '15 at 14:22
@MartinH. The ears suggest that's unlikely, though it's possible he was so self-conscious that he had the artist make them regular-sized in the portrait. – Anthony Grist Jul 12 '15 at 14:47

I thought Nefario was Gru's dad because in the second movie, Nefario says something like, "Nothing can take away my 'Family,'" apparently.

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Many people consider and treat their close friends as "family". – phantom42 Feb 23 '15 at 21:20

In DM2 it appears Dr Nefario is family when Gru weds Lucy.

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Appears how? Can you back this up with any evidence? – Valorum Dec 19 '15 at 16:40

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