No one political party is uniformly pro-life or pro-choice. Already Sinn Féin's Peadar Toibin has broken ranks and indicated he will defy the SF whip and "vote pro-life".
D J Moore @djcpmoore BREAKING : Peadar Toibin (Sinn Fein, Meath West) has just said on RTE News that he will defy Sinn Fein whip next week and "Vote Pro-Life"
Retweeted by irishpollingreport
A couple of other SF TDs are also known to define themselves as pro-life in terms of their views over the years and may do the same.
In FG, James Bannon has given an interview indicating that he has issues with voting for any legalisation of abortion. Simon Harris has moved in the other direction, from opposing legislating for X case to being open to doing so now given the developments in Galway. Other TDs are pro-choice.
Éamon Ó Cuiv doesn't hide his pro-life credentials and may break ranks with his party (yet again - he seems to be the Lannigan's Ball of politicians, forever stepping out and in again). Other FF TDs identify themselves as pro-life while some identify themselves as pro-choice.
Labour is split between the Dublin liberal wing represented by Ivana Bacik and the conservative rural party which is quite conservative socially, so a split on the issue is possible.
So we may witness most if not all parties experiencing breakaways on the issue in any Oireachtas vote.