Probably my top 2 here:
Parental Love - Great Game
Sisterly Lust
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Christmas Eve - F/D alone in a snow storm stuck in a cabin.
New Years Day(e) - Same story just sort of a sequel but includes sister (+ more)
16 Years Later - F/D's
Oh! Daddy - F/D
Double Homework
The Fosters - B/S B/a lot more
The Family In Trouble - Uncle/Niece
Bonds of Love
Ravenous - Takes a while for S/M and Not until Chpt 2 for B/S to really start tho.
THS
and definately agree on the Sunset Fairies listed above.
If you like (or at least don't mind) story driven games:
My New Family - B/S, C/C, S/M, N/A, GS/GM... and so on
My New Memories