This is how your application would look to the visa officer:
1. Property ownership = Immovable assets = Not a compelling reason to return by a specific date
2. Your dad's business = You're not an employee/business partner = No real employment ties = No compelling reason to return by a specific date
3. Your wife (homemaker) + child accompanying you = No strong family ties left behind
4. Visit of 10 days to meet a friend = Why would you/your wife/child travel halfway across the world to meet your friend for 10 days (incurring significant costs)? It's a different matter if one wants to meet family members = Not a convincing purpose of visit
You are the primary applicant. However, if your individual application lacks compelling reasons to return home, then your wife and your child's applications are far weaker.
My suggestions:
1. Apply alone without your wife or your child
2. Defer your visit until you are able to prove that you manage your dad's business on a day-to-day basis.... without your dad.... with evidence
3. Include evidence of your parents' illness. For example, are they suffering from serious medical conditions which require you to return to take care of them.... or do they have lifestyle illnesses (controlled diabetes, high blood pressure, etc)
4. You must explain the source of funds in your personal bank account. Otherwise, the funds will seem as transferred by your dad or your dad's business
