How to explain to my overly controlling family that I am going to be taking a 3 week holiday with my boyfriend they haven't met?

I & my siblings bought the house years ago as an investment & then our parents, disabled but independent, moved in as well.

But my family is controlling, it's something everyone I know from friends to colleagues say. My brother isn't without parents around but he feeds off of their energy - he's a follower & something of a bully himself - and well with the three of them it is stupid at times.

If you say move out - as sister did last year - the house is part mine, it's an investment. Yes I will move out to boyfriend's soon but in the mean time I'm sort of stuck.

How to explain to my overly controlling family that I am going to be taking a 3 week holiday with my boyfriend they haven't met?
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