Are you talking about how the expenses should actually be shared or how they should be treated as being shared for tax purposes?
The expenses are actually shared, as agreed between the parties. With professional fees it ought to be clear who the recipient of the service is (know your client rules?) and who is paying what.
There would be no deemed alternative apportionment for tax purposes.
pcg007 wrote:The family want the majority of expenses to be apportioned to one shareholder
and that would be correct, provided that that shareholder actually incurred the majority of the expenses.