miss spiring

Thanks for your advice.  I may end up living in sin as Wooleybanana recommended.  Once again thanks Miss Spiring  

Can anybody help? I am a 50 something single lady with two grown up children and currently own a property in France and in England.  I have met someone whilst in France and am considering marriage.  My only concern is that the gentleman has six grown up children from a previous marriage.  I have worked very hard all my life and if anything was to happen to me, i would want my two children to receive my estate, with provision for my partner to stay in the house as long as he lives.  Is this possible within French Law?