Congratulate me, now I am a real aunt.
My sister, who lives in Barcelona, has just given birth to the second grandkid in our family. I am filled with pride, and I didn’t even have to do anything. 
It’s too bad I won’t see them for months. 
Somebody should go about inventing teleportation already. We have enough iPods.
Welcome to the world Pau.
Pau, boniiiiiiic! (I’m declaring the baby cute without even having seen the pics)
Congratulations to the whole family
Congratulations!!
Really nitpicky comment, more to equip you with the info. than to hijack: Latin for “nephew” is nepos (cf. nepotism, the practice of hiring one’s nephews and other relatives). Accusative case is nepotem, to give you Habemus nepotem! for the 100%-good-Latin form of your thread title.
ETA: It also matches “Habemus papam” better, which I think you were shooting for. Didja burn white cloth when you found out? 
If I had used all latin nobody would have understood. It was joke Poly, a joke, I tell you!
Hmm… off to burn something.