Hmmm...well some people might object to my calling them philosophers, but two thinkers come to mind on the lovesick issue:
Robert Burton in The Anatomy of Melancholy
And Emile Chartier, who wrote under the name Alain, might also have some helpful insights if you are looking to get out of the dumps. He wrote for some periodicals, and a helpful English translation of a collection of some of his short articles was released in 1989, under the title Alain on Happiness
. Some of the articles seem trite, but read together they are actually pretty impressive in their practicality and full of worthwhile advice.
I'm afraid I'm less helpful on the issue of child-rearing. Maybe some of John Dewey's work, but I'm skeptical that they would actually be much help.