who is the legal landlord?

Other

Hi there, my sister and I inherited a house and to cut a long story short, the house is held in her name but only until I have the funds to buy her half, then she is legally obliged to sell me it. Anyway, I am the one sorting out the letting and taking on all the landlord type jobs. Also, within the legal holding contract, it states that only I am entitled to any profit made from letting and selling (something we agreed as I would be taking on all the renovation and landlord work).
Anyway, I have found a tenant but it has occurred to me that I may not be the 'legal' landlord as such, so as such would I have to put all correspondence in my sister's name and have her sign all the papers to make the tenancy legal?
Any help or guidance would be much appreciated.
Thanks,
Matt.