First of all, the love of your family is different from that you have for your sweetheart. The family is like human heart everyone needs another, and everyone needs always. For example the family like a house that if you feel cold you go inside because you know you will feel warmly. And everyone knows that the meaning of family for him is. The love of family is kind of innate love you gained.
Second, love for your sweetheart is that feeling like someone who owns. This love is one of hard emotion that may be hard to explain. The love for sweetheart is kind of doesn't care about anything at all. Because this kind of love depend on confidence ,feeling and sincere in ourselves.
In conclusion, love is beautiful feeling that you make happy .everyone have his meaning and feeling for the love, because everyone own different feeling for his family or his sweetheart.