If your partner dies before you and you do not have a Will in place, which specifies how your estate would be distributed, your estate will be inherited as follows, by:
Your children, or their descendants if any of them have died before you, but if none then
Your parents, but if none then
Your full brothers and sisters, or their descendants if any of them have died before you, but if none then
Your half brothers and sisters, or their descendants if any of them have died before you, but if none then
Your grandparents, but if none then
Your full uncles and aunts, or their descendants if any of them have died before you, but if none then
Your half uncles and aunts, or their descendants if any of them have died before you, but if none then
The Crown.