What would be a suitable 'breaking point'?

[Semiazas]

I've had an idea for what would probably take shape as a psychological horror film of sorts.
It centres around a family of 3, a father, mother and son/daughter (casting dependent) and there is a level of tension between them and I'm wondering what a breaking point for these characters to be in order to have things escalate.

I know I'd want it all to be quite naturalistic, so I'd shoot it like that, lots of lingering static shots where the camera is where a wall would be so it's like looking in on the house.

 

[letsmakeamovie6]

We will need a little more info to give a reliable answer. What's the story line? Why is there tension?

 

[Alcove Audio]

The "breaking point" will depend upon the characters themselves and the source of the "tension". Does it revolve around the death of a child? Is it a second marriage? Money problems? Emotional/psychiatric problems? Problems caused by an outside entity either natural or paranormal? A combination of all of the above?