How do you handle the family that requires a vehicle for taking everyone on a vacation, and separate vehicles for each member to commute to school and work? Of course this should all fit within the family's budget.
There are many answers, because each family has specific needs that cannot be seen from just a short textual description like above.
The appropriate answer will likely involve several vehicles. They might not all be engine powered. Perhaps some will be short-term rentals. Perhaps some might be public transport. Perhaps some family members will walk to places where they drove before. Perhaps when the transportation needs of the family are considered as a whole, options for combination or reuse will emerge. Maybe some trips just won't be practical after the resource implications are known.
The answers might not be popular, particularly at the beginning of the process, but if you come up with a good solution the pain will be much less than the alternatives. If you don't do the hard part up front then the end result will be an early failure, which will result in far more grief for (and from) the same family members.
The above analogy translates pretty well into your situation. It's you family, so it is you that needs to get them together to make the decisions.
Finally, note that I am not talking about system design or anything like that here. I'm talking about architecture deliverables. Just that, nothing else.
These are not problems that others can solve for you, but they are likely to yield to the wisdom you have developed in your career so far. Just make sure you are thinking about the right things, before you get into building the system when you are still talking about architectural style.
HTH, David
