Relative has moved house recently and despite asking politely, the next-door neighbour repeatedly parks in front of relative's gated front entrance. As the house was unoccupied for a year, they obviously got used to parking in front. Sometimes it is their private car but mostly their commercial taxi. To be honest I think it is very rude and I suggested to relative if it doesn't stop, to complain to the taxi regulator. Obviously, a no parking sign can be put up and I guess that is the way to go. Any thoughts?