I haven't seen that episode of Grey's, but I agree that it sounds very sad. :(

SGA has never made me cry properly, but in "Tao of Rodney" I got a bit choked up, and there may have been a couple of tears in "Sunday".

I think that I might have also cried in that episode of Futurama with Leela's parents. I hadn't realised until this post that I have cried at so many tv moments!