At first, Holly and Eric had an awful blind date. Holly was Alison's best friend and Eric was Peter's. Alison and Peter had a perfect beautiful little girl-Sophie.
But an accident happened and they both died and left Sophie as an orphan. However, the couple has picked the custody ones. So the responsibility of raising the baby fall to Holly and Eric.
And life thus became a totally disaster, but the relation between them was gradually harmonious finally they were into each other. Because they meant to be a perfect couple and the baby and them were naturally a family.
Although this is only in the movie. Life is bitter-sweet, that's fair, so everyone of us should accept what God endows us. There's no way out of life, just smile at it :)
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