Find and Mark Twins (How To)

Introduction

Identifying multiple births can be very helpful. Family Historian can help you find and mark them.

Details

The following expression can be used in a query to spot multiple births (note it will only find matching dates so if you have 2 children with just a year) it will mark them as twins.

twinsexpression.txt
=IsTrue(
(%INDI.BIRT.DATE% = Field(NextSib(%INDI%),'INDI.BIRT.DATE')
) 
or 
(%INDI.BIRT.DATE% = Field(PrevSib(%INDI%),'INDI.BIRT.DATE')
)
)

You can then use the results to set a Flag for future use, or if you prefer, simply use the expression directly in a diagram to condition an icon or other box attribute.

Section how_to