Have no idea re legal matters, so this may be normal but wanted to check with anyone who deals with this.
Pil have made their will splitting everything equally between their children. (All adults)
In the event that one of their children dies before them, eg DH, his share will be spilt equally among our children.
They said it was to protect against me remarrying in that instance.
Presuming this is normal, but it did feel a bit strange, especially as my DM had given us some money when buying our house which obviously would be shared in the event of having to sell. (Eg If DH hypothetically did a runner!)