Define reasonable force that would make you feel safe enough to turn your back on an intruder so that you could go and call the police knowing you have other family in the house...most probably you cant
You catch someone breaking into your house, they move towards you, then what do you do ?
perhaps you have a something heavy to hand that you grab and clump the scumbag with..he seems to go down in a heap so you take the chance and go to the phone to call the police, as you walk off the scumbag gets up and decides to have a go at you ..what you going to do this time ?
As far as i'm concerned you go for them with whatever you have to hand, knife, bat.
If you dont put the person out of the game then chances are they might just do the same to you.
You have to be satisfied that you have neutralised the threat to you and your family, its as simple as that
They broke in , they must take responsibility for their actions and suffer the consequences whatever they are.
How these scum can expect to be protected by the law is beyond me