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Praise be to Allah.
There is nothing wrong with what you have mentioned of making the family savings fund a separate entity within the company and adding the profits to it.
And there is nothing wrong with your selling the land to the company and taking all or part of the price in the form of shares, because the company can buy whatever land it wants, even if it belongs to a member of the company, and you can buy shares with whatever wealth you have, whether that comes from selling the land or otherwise.
And Allah knows best.