Among one of the new features introduced in Fire Emblem: Awakening is the possibility of further developing the support relationship between characters of different sex: achieving a Support relationship of level S will make them marry and let you use their children as playable characters in your unit.
There are a total of 13 children available in the game which can be acquired in Paralogues and Side Missions, appearing after the corresponding mother gets married. Childrens will start joining you after Chapter 13 has been completed.
Pleane not that only certain marriages will give you children and the parents’ stats, skills and classes will deeply influence their abilities so make sure to take good care of all the possible parents. Not getting any of these children will not only deprive you of possible strong units in battle but it will also prevent you from accessing most of the game’s Paralogues.
There’s also no chance to miss the Paralogue mission where you’ll be able to recruit the children: after two characters have married their corresponding Paralogue chapter will appear on the world map after chapter 13. Because of this there’s no need to give any of the character the support relationship of level S before this chapter, except for Chrom, who’s going to get his first children during Chapter 13, no matter what.
Also note that both Chrom and your Avatar have the ability to have two children; all childrens will join you at level 10 and can reach a relationship level of S: however, they can only have children if married to your Avatar. Also, all children will start with a C relationship rank with both their parents.
Children will get their parents’ last equipped skill except for Chrom’s children who get the Rightful King skill. Using this feature will allow you to create some interesting combinations and create some devastating units, taking the best features of their parents.
Owain is Lissa’s son and joins the party as a Myrmidon in Paralogue 5. With Lissa being a healer, Owain’s starting class will be pretty useless if her husband is another magic oriented class: in this case you will have to change Owain’s class as soon as possible. You can also wait until you can transform him into a Demon Fighter thanks to an upcoming DLC: the Demon Fighter class is a physical/magical hybrid, benefiting from both physical and magic stats. If you manage to make Lissa learn the Gale Force skill from the Dark Flier class, you may want to make Owain inherit that skill. To make Owain even better, make sure to get the Missiletain, an exclusive weapon which can be obtained by talking to all Green Unit NPCS in his joining chapter.
Article from Gamersyndrome.com