The short answer to this question is no. Naming your child as the recipient of your home in your will does not give them any right to your home while you are still living. However, understanding why requires a little more explanation.
Title Is Key
When it comes to real property such as a house, the person who has title to (or legal ownership of) the property controls the property. The title holder (owner) can lease, mortgage, refinance, sell, gift, or do anything else with the property. When you purchased your home, you received title to it through a deed. This deed proves you are the owner and you have all rights to your property.