Between your children. Plus any other legacies, but treat the children equally.
I understand people will have reasons for doing it differently, but you just leave behind a world of hurt and possible friction between siblings.
My Dad spends a lot of time thinking about his will and inheritance tax and occasionally floats various ideas past us. ATM as far as I know, it is to be split equally between SDsis and I . I often tell him I don't care, I wish he'd just spend it all, and I mean it.
However, his latest idea is that he'll leave the lion's share to me and my DC because I'm widowed and neither I or DC are likely to be left anything by DH's parents, whereas DSis's family stand to inherit well from her inlaws.
I'm horrified at the idea. It's probably true that DSis needs the help less than I do, but neither of us are broke and as I understand it there's a decent sum (care home requirements excepted) to split anyway. I think it's about more than the money, and DSis would be entitled to feel very hurt if our parents do anything unequal. Plus no one really knows what ILs will leave or who to.