Can someone help with writing a query to select individuals who are siblings. The background is that I have 2 sisters listed in a PCC Will and I'm not sure which family they are from. I'm doing a One Name Study so I have over 1500 family groups to check. For a one-off I could just browse my list of individuals but it would be useful to have a pre-built query. I thought about using the Pool number but that would probably pick up people in different generations. I've also thought about using a Family ID number but that would not allow for half-siblings (and I'm not sure of the syntax). Similarly, as they share the same mother / father, could that be used (again, I'm not sure of the required syntax). Many thanks Brian