That goes only for the Celia marriage. It`s faster to only sleep during the whole first year and wait for Vesta and Celia come to your house and go wedding her. Or giving the woman of choice a few Gifts and one heart event.

At the end of the first year, the Lady, who most like the Farmer can be married, doens´t matter, how far her hearts are.

Or do they have to have 3 or 4 Hearts and mostly all heart Events have to be seen ?

I believe in this thread: http://www.speedrun.com/hmawl/thread/kb681 they came to the conclusion that the player must be the one who proposes to the girls with the feather to count. ^^