Living in one's parents house after their demise

Q: If a person is living in his parents house and he has no resources to live somewhere else, so is it necessary in Islam to sell his parents house after their death? If he doesnt do that before getting financially stable, is there anything that his mother or father are getting gunah in the other world? I want to sell the house after some time just to ensure my mother or father is not getting any gunah for this? All my siblings have no problem with me living in the house.

Usurping the share of a child's inheritance

Q: My mother died when I was 8-9 months old and my father married another woman and had 2 more sons. But before that, my mother's property was all sold or distributed among many but me. I wasn't given a single portion of the property. And they even kept all this a secret from me till now, I wasn't even told that my real mother had died.

My question is that is this according to Islam, are they right or justified? And Is the selling and distributing of my real mother's property to others without her will (as she died suddenly) right/justified?

Friend missing salaah with jamaat

Q: I was in the car and going towards the mosque and it was me and the driver in the car. We were getting late for prayer in the mosque and got stuck in a alley in the car. To the best of memory I got out and asked the driver that just park towards the side of this alley and come as namaz is getting late. He said no no the car will get scratched. I made it to the mosque Alhumdullilah and got 1 rakah of prayer and prayed that he also makes it. Afterwards I found out that he missed the prayer and prayed alone in the mosque. Have I done someting bad or a sin?