1. 50% house belongs to you (wife)
2. 50% house belongs to Husband (presumably who died without executing any WILL)
3. You and your son are legal heirs of Husband. Hence Wife has rights of 25% of Husbands Share AND Son has has rights of 25% of his Father's Share.
4. 25% of Son who is minor CANNOT be sold without obtaining Court permission. Hence obtain Court permission.
5. HOWEVER IF you have WILL of Husband wherein Husband has willed his 50% to you, THEN you can sell the property without any court permission or whatever.