Some how I don't see guys like Yoda and Mace Windu tacitly keeping it to themselves. They make it very clear that such attatchment is a danger, not something to be played around with or taken lightly. The idea that they would know about it and just let it slide it completely and totally out of character for both of them. I still find it funny we feel the need to stretch things to bizzare degrees just in order to make them make sense.

Even Obi-Wan seems to know be 100%, he just suspects. When he goes to Padme to warn her about Anakin he asks her if the baby is Anakin's. Had he know they were married, or even together, that question would not have made any sense. He suspected it, but didn't know for sure.