Well I'm not going to write the whole thing for you but I will give some ideas.
Explore how the fortune was acquired:
One of them may have created an invention that changed the world
Won the lottery
Won a competition
Saved the world
Robbed the London Bank
Whether the dynamic within the family changed:
They might all become robbers.
The parts might start argueing and cause a split in the family.
The parts might start arguing and they might go to a mini war within the family.
Hope I helped
(p.s please please please could I have Brainliest seeing as I wrote a lot there)