By Sarah Bull

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It's definitely not your usual family set-up.

And as families around the world celebrated Father's Day yesterday, Woody Allen's estranged son Ronan posted a sarcastic message on his Twitter page.

Ronan, 25, tweeted: 'Happy father's day - or as they call it in my family, happy brother-in-law's day.'

Sarcastic: Woody Allen's son Ronan Farrow tweeted 'happy brother-in-law's day' in reference to his father's relationship with his adopted sister

Sarcastic: Woody Allen's son Ronan Farrow tweeted 'happy brother-in-law's day' in reference to his father's relationship with his adopted sister

Controversial: Ronan's message was then retweeted by Allen's ex-wife Mia Farrow

Controversial: Ronan's message was then retweeted by Allen's ex-wife Mia Farrow

The message was then retweeted by Allen's ex-wife Mia Farrow, who added the word: 'Boom'

Ronan's tweet makes reference to the fact that Allen, 76, is married to Soon-Yi, who was the adopted daughter of Farrow and her second husband Andre Previn.

Speaking previously about the relationship, Ronan, who now works for the Obama administration, has said: 'He's my father married to my sister. That makes me his son and his brother-in-law.

'That is such a moral transgression.'

Estranged: Woody and his son Ronan haven't spoken since the early 1990s

Estranged: Woody and his son Ronan haven't spoken since the early 1990s

Boom! Mia Farrow retweeted the message with an added comment of her own

Boom! Mia Farrow retweeted the message with an added comment of her own

Allen was seen giving adopted daughters Bechet and Manzie a hearty hug in Beverly Hills over the weekend.

The 76-year-old movie maker was also accompanied by his 41-year-old wife for the day out.

While Allen seemed in good cheer, Manzie did not seem to be in the best of moods, even though she was visiting one of the city's poshest hotels at the Beverly Wilshire.

Happy family: Allen was seen giving his daughters Becohet and Manzie a hug in Beverly Hills on Saturday

Happy family: Allen was seen giving his daughters Becohet and Manzie a hug in Beverly Hills on Saturday

Walking on: Allen's wife Soon-Yi chatted with a friend as she pranced around the grounds

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Here's what other readers have said. Why not add your thoughts, or debate this issue live on our message boards.

The comments below have been moderated in advance.

Who can blame him? His father betrayed the whole family when he ran off with the adopted sister of his own children. We keep getting our knickers in a knot over gays getting married when it is THIS kind of thing that is the problem.

Ronan looks remarkably like ol' blue eyes to me :)

I feel for him. When someone you trust and look up to, does something as appalling, its very hard to forgive and 'move on'. My father constantly flirts with my step-daughter and it makes me want to wring my head off. so i get why Ronan is still upset and he is justified

For those saying that Allen's marriage to Soon Yi has lasted 16yrs, you must remember he had to marry her and stay with her to save his face. The affair may not have come light if Farrow had not discovered nude photos Allen had made of Soon Yi at the time Farrow and Allen were partners.. The only thing which saved him was that Soon Yi was over the age of consent. But Allen had tried to keep this affair a secret, so obviously he knew it was wrong, until he got caught.

he hadn't adopted her, she isn't his blood, clearly not even his race. Get a life and leave the guy alone.

I can't be bothered looking it up for myself but how old was this child when Mia Farrow introduced her to Woody Allen? And how long did they live together in an "adult and child" scenario? That's what I would judge the situation by.

Ok so Woody did'n adopt Soon-Yi but she was bought up by his biological son's mother! (whome is Soon-Yi mother as this is how she would have been bought up) Therefore he married his ex-partners daughter and his son's sister! That's wrong, immoral and disrespectful of Soon-Yi and Woody no matter how anyone tries to justify it!

You know, there was nothing normal about the Farrow/Allen relationship from the start. They lived in separate houses. She collected kids like Beanie Babies. They had children out of wedlock. So you can only imagine what went on between them. So it doesn't seem totally crazy that he might show interest in an 18 year old who let him have naked pictures of herself. Maybe it was her way to get back at Mia for something? But all we know is they have been married 15 years and have made it work. AND that Ronan is one bitter young man. Not the kind you want to date. He's a momma's boy, super smart and angry .. bad combo.

Look - this young man LIVED through the situation and knows much more about the specific creepy details than we do. I, for one, believe he has the right to have negative feelings about Woody & Soon Yi -- and the right to express those feelings without criticism from strangers.

Gotta hand it to him, at least he has a sense of humor about the whole thing!

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