Yes, this is part of our draft cross option agreement. If the client wants to include an option for them to be able to sell their share of the business on diagnosis of a critical illness they simply need to include the relevant paragraphs in the agreement.
However, our draft agreement can also include what we call a deferred double option on critical illness. If this option is chosen the partner or shareholder will have an option to sell their share of the business as soon as they qualify for a payment under their plan. But if they do not return to work within a specified period, usually 12 months, the other partners or shareholders then have an option to buy the ill person's share.