Bloodline

You take a drop or more of blood from a person and think about a member of their bloodline. You know the exact distance and direction of the target as long as the target is on the same plane of existence as you.

While under the effects of this spell you also know what the target looks like but forget their appearance as soon as the spell ends, unless you knew what the person looked like before casting the spell.

The target also knows what you look like and your exact distance and direction as well. 

This effect lasts until you drop the spell, you are no longer on the same plane, or are within 5 feet of the target.