Shorthold Tenancy Agreement Whsmith

I think a court would look at the tenants with the most kindness, since they did what was necessary and signed the first agreement that was submitted to them. They paid the first month in good faith. What are our rights? Can we break the lease without others agreeing? We have read a lot of information about it, but everything seems contradictory. I want to rent my twin house to my daughter, who is 17, and his girlfriend, who is 18. Can my daughter sign the lease if she is under 18? What possibilities do we have if she is not able to sign as a minor? I am in the third month of a one-year guaranteed short-term lease agreement. .