A bit of background - My mum and her husband have a grown up child together and two grown up children each from previous marriages. Unfortunately the family is rather dysfunctional and myself and my older sister from my mum's previous marriage have no contact with our stepfather or step siblings and haven't had any for many years.
Our mum has recently informed us that herself and her husband have made DIY wills. These leave everything to each other upon their death and she says they trust the surviving spouse to split their estate between the 5 children when they die.
If my mum died first myself and my sister believe there is a strong possibility her husband would leave all of their estate to his 3 biological children only and that he has persuaded her to make DIY wills in order to enable this. She never questions him. Is there anything we can do legally to contest this if he does?
TIA