The topic says it all:)
It's unlikely; the press packs for Season 2 and 3 and Edith in the 2013 Christmas Special both confirm that Rosamund was childless.
At the same time, perhaps Rosamund did exactly what she advised Edith to do. When Edith said "you've never been a mother," Rosamund didn't agree/confirm. She looked rather uncomfortable.
That's what I wondered at first too. But then if I were struck by one of Lady Edith's zingers, I would be uncomfortable regardless of my past actions.
IF - and this is a very big IF - Rosamund DOES/DID have a child, it's more likely to be the elusive "cousin Freddie" rather than Sampson.
No, Sampson, I think is just a liar, thief and gambler... who Gregson should hit if he returns.
I fail to see how it´s more likely "cousin Freddie" than Sampson. Liar, thief, gambler, still Lady R keeps him close. Time will tell ;)
Hmm... as far fetched as it is, I think it more likely that Rosamund is Edith's mother than Sampson's.