You will be away from home for virtually every important moment and crisis of youf life.
You will miss the birth of your son, you wife will have an accident and need emergency surgery when you are halfway around the planet. A tree will fall through the bedroom of your house while you are half a world away, your dog will die while you are away for 8 weeks of training. You may have a kidney stone in a far away land with poor medical treatment.
This is just from MY life, and I work for major airlines with VERY good rostering and days off and the ability to trade time and get ANY day off I need just by asking.
The problem is that these things happen while you already a day or more from home. Your wife might have the baby 2 weeks early etc....
If you don't LOVE flying forget it. There are waay to many sacrifices that come with the job. Its a great job if you are single and love to travel and LOVE flying.
Cheers
Wino