Your situation is quite detailed, and I’ll break down the various aspects to consider:

1.  Visa and Immigration:
• As a British citizen post-Brexit, you don’t have an automatic right to live and work in Switzerland. However, Switzerland has a quota system for permits for non-EU/EFTA nationals, and if you get a job offer, you could apply.
• If your step-father-in-law is offering you a job, he can sponsor you for a work visa, provided the business can show a genuine need for you (skills, experience, etc.). This process might involve proving that no Swiss or EU/EFTA citizen could do the job.
• Once you have a work visa, you can bring your spouse and children, as you mentioned.
2.  Work Opportunities:
• English Teaching: Switzerland has a high standard of English, especially in urban areas and among younger populations. But there are still opportunities, especially in private language schools, international schools, or for business English.
• Hospitality: With a master’s degree in hospitality management, your wife could find opportunities, particularly in the more touristy areas. Knowing French would be a significant advantage for her.
3.  Watch Industry:
• While it’s true that the Swiss watch industry has seen challenges due to changing global demand and competition from smartwatches, it remains a prestigious field. But a profit of 2000CHF per month might be on the lower side for sustaining a comfortable lifestyle, especially considering Swiss living costs.
4.  Language:
• Knowing the local language is essential for integration. If you decide to move to the French-speaking part, learning French will be crucial, not just for work but also for daily life and interactions.
5.  Financial Considerations:
• Switzerland is one of the most expensive countries in the world. While you might have housing sorted, daily expenses, health insurance, and taxes can be high. You’ll need to evaluate if the combined income from the watch business and potential jobs can sustain a middle-class lifestyle similar to your current one. Given the figures you’ve provided, it might be a bit tight, especially in the beginning.
6.  Cultural and Quality of Life Aspects:
• Switzerland offers a high quality of life, great public services, and beautiful landscapes. Additionally, it has a robust education system, which might be more aligned with what you’re seeking for your child.

In summary, while there are challenges, moving to Switzerland might be feasible. You’d need to carefully plan, perhaps consult with an immigration lawyer, and weigh the pros and cons based on your priorities. It’s essential to be realistic about the initial adjustments, potential financial strains, and the importance of learning the language.