To blog or not to blog.

I'm just a normal Woman, daughter, Wife and Mom, with no fascinating background or shady past yet for some time now I have this urge to write letters to my 3 children (Mr., Madam Fluff and Snuggle Bug) and to my family.
While attempting to make a will, I thought to myself; what will I leave for my family? What do I have to leave behind that will remind them of me and let them know how very much I love them? Come to think of it, no material object can really let a person know how much they were loved, bar the fact that at present, being a housewife and mother, I don't really have any possesions that I feel would give them this sense of love. This sounds all terribly depressing so far, but hear me out. If I were to leave behind letters for my family for them to find one day when I am no longer here or even if they come across it while I am still alive, surely my thoughts and memories of our days spent together would make them all know how much I cared for them?

The only question I have now though is this; do I pen the best times of our lives letting them remember only the good, or do I record most moments including the tantrums, the fights and the days where I feel that God has entrusted me with a little too much and perhaps this one time could have possibly underestimated my abilities as the mother and wife of those precious lives He gave me to take care of? What do you suggest? I started to type a few letters on my PC and then discovered blogs through an aquaintance, but now I'm wondering, is this impersonal or too personal to blog? Would they rather read love letters left behind written in my own hand on paper that smells like me or my favourite perfume?
Far too many questions for a first blog.