I missed the first few minutes, but what I saw:
Justin was at Adrienne's grave and told her he wanted to marry Kayla,so he asked her to give him a sign that she approved. Just then, Sonny showed up. So they talked for a while, and Sonny approved of the proposal. Justin went to see Kayla at the hospital, and proposed.
Will, Marlena and John were at the pub with Nicole and Eric, and everybody was afraid to call Sami to tell her Eric was going to marry Nicole, so she took the bullet and called her. We didn't hear Sami's end of the conversation, of course, but Nicole said she was very nice and congratulated her. Then Sami immediately texted Eric, saying "How could you propose to that bitch?"
Xander yelled at Brady about letting Kristin disappear with the baby, and then taunted him about claiming to love Kristin but he's already in bed with Sarah. Sarah said that Brady is a much nicer guy than Xander, and besides, he's good in bed.
After the discussion about Eric and Nicole getting married, they all had a discussion about needing to grab the moment, so Will went back to the mansion and Sonny showed up, and they agreed that now is the time to have a baby.
I'm sure there was something more, but I missed it.
Twins have different fingerprints, so clones probably would, too, except in Salem.