Cody/Sasha & the 1st Cousin Factor
Contrary to the "Yikes! It's gott be over!" default being deployed on GH, being 1st cousins does not = the automatic end of a romantic relationship.
1st cousins having kids does not = 2 headed kids, it raises the risk of birth defects from about 2% to about 5%.
To avoid that risk, Cody could simply get a vasectomy and he and Sasha could carry on their relationship as they see fit, including getting married. Yes I know, a highly unlikely future in GH esp given their overwhelmingly pronatalist themes.