This article gives an over view
Army Pilots Course - British Army Website
IN FOCUS: British Army fights to influence helicopter training choices
You will get time to be with your family albeit sporadically but any flying training course is intense, you will find your own balance.
I worked recently with an ex 1 para Tom who now flies the Typhoon. Go for your dream and as others say, ignore those that try and put you off, encourage those who have their own dreams.
Good luck.