Can someone shed some light on the Young and the Restless?

So I have not watched in a couple of months, but I pretty much am caught up, I am impatient and would like to know some spoilers!! So, is Tucker really Ms Chancellor's or is he a twin she did not know about or what, so is Sheila really coming back and those evil kids are hers? Neil and Ashley? When will Sharon find out the baby is hers, and when will Nick finally remember that Summer is not his? And is Patty going to switch with the Dr. that Jack is going to marry? Geez, I could go on! Please someone tell me something!! Thanks!!