The chances are almost nil. In Iceland, because it's an island nation of so "few", it does increase somewhat enough for them to put out an app that helps to avoid it but even the experts agreed that it was unnecessary and more for fun than anything else.
Thankfully a single instance of incest between half siblings is not that risky, it's typically multi-generational incest where you see large numbers of genetic disorders.
[ + ] RMGoetbbels
[ - ] RMGoetbbels 0 points 2.4 yearsNov 25, 2022 14:01:58 ago (+0/-0)
[ + ] Steelerfish
[ - ] Steelerfish 1 point 2.4 yearsNov 25, 2022 09:08:46 ago (+1/-0)
[ + ] NaturalSelectionistWorker
[ - ] NaturalSelectionistWorker 1 point 2.4 yearsNov 25, 2022 08:54:18 ago (+1/-0)
[ + ] Reawakened
[ - ] Reawakened 2 points 2.4 yearsNov 25, 2022 07:21:02 ago (+2/-0)