That's economic suicide not sacrifice, for many small businesses the asset produces the revenue. Sell the asset you may as well close the business. It is not a fair assessment of a family's means at all.

It's not equivalent to making all your income off one rental and having to sell it, but it is closer to that. If you sell it, you have no income now. But a small business also creates jobs and provides novel value to the community, so even more is lost than just a single income.