Last will and testament

We are also about to sort out our wills, but when researching this I had read somewhere that if you opt for French law then your spouse gets a share and the remainder divided between any children. The concern I have of this is that it stated that your husband/wife can remain in the property for the rest of their life - but if you want to sell then the value of the property could to be shared if the children so demand. I am reluctant to do this as I want to be in total control of where I live and how I live. Anyone confirm if this is correct please. Also if you decide to do a handwritten will and opt for English law is it possible to lodge this with the notaire?.