I know what you are saying I think, What age was he when he became your Step Son, ie if he was say a 3 yr old than I would say he should have same amount as his half Siblings, say he was 15 yrs than maybe a token 5% for example , Do you see where I am coming from, might sound a bit like lenght of service in a job with regard to what you would get if let go. But if you went first a hubby is left say half your land then his son would be entiltled to a 1/3 of that if he passed away I think, but not sure, But for a peaceful home I think you need to chat to hubby, what had he got before he met you and what are his intentions in his will regarding your kids, ie would he leave his own child most of his cash,