What majority to overturn Roe?

I've read in more than one place that with the appointment of Judge Alitio to the Supreme Court, it is a majority to overturn Roe.

Can't anyone count to 5?

There would be only 4 safe overturn votes: Roberts, Scalia, Thomas, and Alito.

There would be Stevens, Breyer, Ginsberg as keep Roe votes.

What about Kennedy and Souter? They were both on the court and voted to overturn the spousal notification laws of Pennsylvania is Planned Parethood v. Casey

Has anyone detected any movement towards pro-life on the part of Kennedy or Souter?

The 1987 disaster that was the Robert Bork confirmation hearings gave us Justice Anthony Kennedy, a pro-choice Catholic.

Update:
This item was edited to reflect that it was spousal notification which was struck down, and parental notification was upheld in Casey. Since then litigation to strike down all parental notification laws continues. I am grateful for the opportunity to correct this.