The simple answer is "maybe". In order to sell the house he would need to get you to agree, or he would have to apply to the Court for an order under Section 14 of the Trusts of Land and Appointment of Trustees Act 1996. The Court will make such order as it thinks fit, but will approach the situation on the basis that the house was purchased as a home for you and your son (and husband) and that purpose continues, hence a sale would not be expected.Even if you were to divorce the Court would not want to see you and your son homeless.