Braking system Manipulation

Hello dear community, I have registered for the current occasion. We live in an apartment house with >10 parties – actually everything great. However, a woman and her son apparently have massive psychological problems (bipolar disorder probably in combination with other things) and these have recently issued unspecific threats against several neighbors. My neighbor and I somehow at the same time came up with the idea that we would probably have to look at the brake lines regularly . I give the scenario maybe only 1%, but would like to largely exclude this WorstCase for me and my family. Especially since the landlord will soon significantly increase the stress level of the woman. How does one proceed technically to detect manipulations? What would happen specifically with the Golf 6 (BJ2011) during manipulation? -Warning lamp? (probably no) -if one presses the brake pedal two/three times before starting, would one with an eletronic? Pedal at all in the Sta And remember what? – Where would you see a puddle? I change a light candle (diesel), but here I know zero. Everything unsightly, but maybe there’s a technical encouragement from you. Thank you, a worried golf6 driver.