Hello and thanks for using Just Answer.
I am Al and am happy to assist you with your enquiry.
1. Yes, as a legal owner, you are entitled to live in the property as long as you wish.
2. You are entitled to sell your 50%. In practical terms, whether any non family member would be willing to buy, bearing in mind it will only be a 50% share, is another question.
3. As Tenants in common, either party is entitled to go to Court to obtain an Order for Sale.
I hope this helps and answers your questions.
Yes- they would have become entitled to live in the property.
All owners are entitled to reside/enter into the property, so all of them would have a right of entry.
Hope this clarifies matters.