You should make a will.
Intestacy rules are just that - if you don't make a will, the Succession Act fixes who gets what. Once you make a will, you yourself are making that choice.
As you are married and have children, the law says, if you are making a will, that you must leave not less than one third of your estate to your spouse. Your spouse may also choose to appropriate the family home in satisfaction of his/her share. If the value exceeds his/her legal right share, s/he may have to pay monies into the estate. If you transfer the property into joint names now or during the course of your life, the family home will not form any part of your estate but will pass automatically to the survivor.
For what it is worth, most practitioners would assume that a married couple would wish to make proper provision for each other on death with the offspring to benefit when both die. So, 95% of wills made for married people in my office would be of the "save for some bequests set out, the entire estate to each other with secondary provision for the offspring " variety.
mf