Following the law of the land that does not conform to shar`ee law

Q: I am 20 years old and live in the UK. Here we are obliged to have car insurance. Similarly, for delivering food etc. (Uber eats) we are required to have food insurance. Insurance companies don't supply that to us until we are 21, so right now, I do food delivery for Uber eats on a normal insurance. That would mean that I am not abiding by the law of the land, would that make my income haraam?

My dad is currently not working and I am paying rent for the house. Furthermore, I intend on buying another car in the next few months. If this income is haraam, when I am 21 and do the food delivery legally, but the car I use to deliver the food is from haraam money, does that make whatever I earn haraam?

If it is haraam, once I turn 21, can I repent and give the calculated amount I've earned up until I became 21, to charity? Would my income thereafter be halaal? 

Zakaat on cash buffer in a property trust

Q: A trust was formed and a property was purchased for investment purposes. Shareholders bought into the investment. A portion of the net rental are distributed to the shareholders and a portion of this net rental is held back in the trust as a cash buffer for unforseen events (e.g. Unforeseen expense). What is the zakaat implications on the cash buffer held back in the property trust?

Maintaining family ties with relatives who are jealous

Q: Our relatives sometimes hurt us, like some of our cousins are jealous of us and do things that actually hurts us and try to degrade us. At first, all our relatives would dine with us but when they started being jealous of us, all our relatives were far away from us, especially from our family and because of that I am in very bad condition.

I am mentally disturbed... and I actually don't know what to do. I am just making sabr, because at this point I can't do anything and this thing is actually happening for 3 to 4 years already. What does Islam teach us to do at this point?

Being sinful for stray thoughts

Q: We have read that we are rewarded for good thoughts, but not sinful for bad thoughts as long as we don’t act on them. But we have also heard that we are responsible for our thoughts and therefore sinful for thinking wrong. So what is true? Because we do think of sins, for example, sometimes our mind just keeps going to some bad thought even though we try to remove that thought from our mind, but it keeps coming. We even pray for that thought to go away, but it doesn’t. So are we sinful for bad thoughts like this?