It appears that Lee Beattie is patient zero of the photo that has gone viral this AM -- and if we are to believe what she says (and why wouldn't we, she seems very pleasant) one of the men in the picture is the husband of her friend, the questionably named Mary J Rottencrotch. And, according to The Daily Mail, the duo's true identities are Neil Douglas and Robert Stirling -- both Englishmen. And not only were they on the same RyanAir flight, they booked the same hotel in Ireland.
At any rate, we can only assume the two finally figured out that their parents had separated shortly after the twins were born, and did the only logical thing, custody-wise: split the twins up, move to two totally different continents, and never speak of the incident ever again. But at least they are friends now (they shared a pint after the flight, and I'm assuming they exchanged numbers).