Your '' remedy '' if there is one, would be to apply to the Court for an order for sale. I am, by the way, assuming you are not married, and what follows is offered on that basis.
The chances are that, if you make an application at this time, the outcome would be that the Court would make an order for sale but defer its implementation until your child was 18. I don''t know how old he is but if you want to force a sale now, rather than later, the odds are clearly against success.
When he does reach his majority, the probability is reversed, and the odds are that the Court would make an order. There remains the question of what the division would be.
If the property is in joint names, the chances are that it would be 50/50, but it must be stressed that this is not automatic. Legal advice is always recommended.
Again if the house is in joint names, your former partner could not sell the house or mortgage it without your agreement.
Unfortunately asking a question like this is rather like asking whether I can repair my own car. The answer is, yes, I can, as long as I know how to do it. But if I don''t I''m best advised leaving it to someone who does.
At the moment, if you take legal action, the outcome is probably an order for a sale deferred until your son is 18, followed by some provision as to division of the proceeds.
It is not very sensible taking legal action if you might lose, the outcome could very well be that you would have to pay the other side''s costs.
You should be able to find a solicitor who will give you 20-30 minutes free legal advice. You have two tuppence worth.