@Green_vs_Red:
Basilio and Flavia at least for an S support anyway. And finally on the verge of beating my 2nd and 3rd playthroughs once I finish those I'm going for everyone's S supports. Yes I know I still haven't beaten you yet Dark Moon stop reminding me.
After Henry joins, any further people that join, that aren't children, can only achieve S support with the Avatar
–- Update From New Post Merge ---
@black-leg:
basilio and flavia can't have an s support and now i've beaten the game for the 1st time and it only just occured to me how many supports morgan can have
Yea its rediculous.
Can have anybody be his mom or dad (47 possible choices)
Can have any child be his sibling (12 possible siblings)
Can marry any opposite sex child (12 possible spouses)
Havne't paid attention to same sex children. Does Morgan get a support with every child like Lucina does?
In order to get every support convo with Morgan you would need to do a shit ton of marriages with Avatar, get child, then have Morgan talk to parents and any siblings, then reset and move on to next marriage. Rinse and repeat like 100 times considering have to do this for male and female versions.