just a update ladies...

As i recently just hit the 12 week mark, and also the fact my belly is starting to **** out like ive eaten one to many cheeseburgers i decided to tell my parents we are expecting #2 already! They were in complete shock as its very quick but as explained it was our little woopsie anyway all went fine, besides her complaining shes not old enough to have 3 grandchildren shes only 44 haha anyway while there DP and dad wondered off to look in the sports shop so i took the opportunity to ask mum how to approach my sister.

mum advised me to invite her over to dinner tonight as dp wont be home as his going to his best mates going away BBQ. so she is coming over at 7pm so that gives me time to get Oscar to bed etc.. anyway this is where i need your ladies help.
WHAT DO I SAY! i know my sister and she is going to be angry/upset no matter what i say. Im not a confrontational kind of person, and try avoid conflict.
so if anyone has any tips to start the convo off etc.. it would be greatly appreciatedd