The most suitable form for the given scenario of business engagement would be a general partnership. A general partnership is a contract between two or more individuals who link hands to undertake a business undertaking for profitability. Each partner gives cash, material goods, skills, or effort, and every one of them shares earnings and losses of the business, and everyone has limitless (unlimited) liability for the business' liabilities. Therefore, this form of business entity will ensure that Jane, James, and john contribute an equal amount of money, skills, labor, or property to the business. Additionally, each will have unlimited personal liability for debts, and they will share the same amount of profits and losses.

Financial Disclaimer: This information is for academic purposes only, and it is not a substitute for professional financial advice.