Death of a tenant in common, no other beneficiaries

My sister in law and her husband own there home as tenants in common. He has now passed away and she would like to sell the house. His will states that he leaves everything to her. What do we need to do for the Form A restriction at the land registry to be removed so she can sell the house? Does she need to appoint a second trustee as there there are no other beneficiaries

Stephen - it's very much up to you/her conveyancer as to what you do to enable the sale to happen.
Appointing a second trustee is one option - see PG 21 section 6 Using our forms for complex and more unusual transactions (PG21) - GOV.UK (www.gov.uk)
Or if she's now both the legal and beneficial owner she can apply to cancel the form A restriction using forms RX3/ST5 - see PG 6 section 8 - Devolution on the death of a registered proprietor (PG6) - GOV.UK (www.gov.uk)
 

Thanks, if we take the second option do we need to send the death certificate and a copy of the will to the Land registry or just the the death certificate?

Stephen - we need the evidence of death but we don't need the will. 

Thanks also does form DJP need to be filled in too ?

Stephen - that is the second option so yes re form DJP + death certificate. And forms RX3 + ST5. 
If you are selling though I would suggest option 1 is the 'better' option re 'speed' for example but your conveyancer may view it differently