Marriage (Harvest Moon: SNES)
From Harvest Moon | Rune Factory Wiki
Marriage and Children:
If you want to get married you must have seen the event with the girl you like and she must have 5 hearts in her diary. On Sunday go to town and the wandering peddler will be there and he will sell you the blue feather. On a nice sunny Saturday go to your shed and equip the feather (it works like a tool) and give it to the girl you like. You must have at least the first house extension and she might refuse a few times but keep showing it to her and she will give in and accept. The next day you will get married and she will move in your home.
Children:
To have children you must have the second house expansion. In the game you can have multiple children. The sex of your child is totally random and if you want a child your wife must love you lots, you must talk to him/her everyday as much as you can and give him/her at least two presents a day.
One day your wife will have a child and it sleeps in the cradle, then it grows up and crawls around, and then it finally stands up and wears a little cow dress your wife makes.