Hi Heather,
Without a specific title number to check i can only speak in the most general terms based upon your description above..
As already stated you would need DS1 and possibly DS2, it also sounds like you need a TR1 and application form AP1. You would also need to provide evidence of identity for all parties using forms ID1. From your description it sounds as though you would also need to consider any trust rerstriction on the register; If so then our PG 24 section 6 explains how to apply to cancel/withdraw such restrictions
Private trusts of land (PG24) - GOV.UK