Board Thread:General Discussion/@comment-24674051-20150420171129/@comment-5106672-20150421162331

Besides, when Marian died / disappeared / actually died, Roland must have been what, no older than two? So, while he remembered her as his mom, I don't think he could recall what she acted like much in detail.

As for how she even knew about Robin and Roland, she sent Gold after them to retrive Regina's heart, and when she came back from the past it was them who first approached her, so no big wonder. It's trickier to wonder how she knew Marian was Robin's wife, but let's assume she spied on him from Oz after he stole from her. She must have remembered once she found out Robin was dating Regina in Storybrooke, and as she said, when Emma rescued her, inspiration struck!